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Ma Y, Yelton J, Tanida K, Adachi I, Ahn JK, Aihara H, Al Said S, Asner DM, Atmacan H, Aushev T, Ayad R, Babu V, Bahinipati S, Banerjee S, Behera P, Belous K, Bennett J, Bessner M, Bhuyan B, Bilka T, Biswas D, Bobrov A, Bodrov D, Borah J, Bozek A, Bračko M, Branchini P, Browder TE, Budano A, Campajola M, Červenkov D, Chang MC, Chen A, Cheon BG, Chilikin K, Cho HE, Cho K, Cho SJ, Choi SK, Choi Y, Choudhury S, Cinabro D, Das S, De Nardo G, De Pietro G, Dhamija R, Di Capua F, Dingfelder J, Doležal Z, Dong TV, Epifanov D, Ferber T, Ferlewicz D, Fulsom BG, Garg R, Gaur V, Garmash A, Giri A, Goldenzweig P, Golob B, Graziani E, Gudkova K, Hadjivasiliou C, Halder S, Hayasaka K, Hayashii H, Hedges MT, Hou WS, Hsu CL, Inami K, Ipsita N, Ishikawa A, Itoh R, Iwasaki M, Jacobs WW, Jang EJ, Jia S, Jin Y, Kaliyar AB, Kang KH, Kawasaki T, Kiesling C, Kim CH, Kim DY, Kim YK, Kinoshita K, Kodyš P, Korobov A, Korpar S, Kovalenko E, Križan P, Krokovny P, Kumar R, Kumara K, Kwon YJ, Lam T, Lange JS, Lee SC, Lewis P, Li LK, Li Y, Li Gioi L, Libby J, Lieret K, Lin YR, Liventsev D, Luo T, Masuda M, Matsuda T, Matvienko D, Maurya SK, Meier F, Merola M, Metzner F, Miyabayashi K, Mohanty GB, Mussa R, Nakamura I, Nakano T, Nakao M, Natkaniec Z, Natochii A, Nayak L, Nayak M, Nisar NK, Nishida S, Ogawa S, Ono H, Oskin P, Pakhlov P, Pakhlova G, Pardi S, Park H, Park J, Patra S, Paul S, Pestotnik R, Piilonen LE, Podobnik T, Prencipe E, Prim MT, Rostomyan A, Rout N, Russo G, Sandilya S, Santelj L, Savinov V, Schnell G, Schueler J, Schwanda C, Seino Y, Senyo K, Sevior ME, Shan W, Shapkin M, Sharma C, Shen CP, Shiu JG, Simon F, Sokolov A, Solovieva E, Starič M, Sumihama M, Sumiyoshi T, Sutcliffe W, Takizawa M, Tamponi U, Tenchini F, Uchida M, Uehara S, Uglov T, Unno Y, Uno K, Uno S, Urquijo P, Usov Y, Vahsen SE, van Tonder R, Varner G, Vinokurova A, Vossen A, Wang D, Wang MZ, Watanabe M, Watanuki S, Werbycka O, Won E, Xu X, Yabsley BD, Yan W, Yang SB, Yin JH, Yuan CZ, Yuan L, Zhang ZP, Zhilich V, Zhukova V. First Observation of Λπ^{+} and Λπ^{-} Signals near the K[over ¯]N(I=1) Mass Threshold in Λ_{c}^{+}→Λπ^{+}π^{+}π^{-} Decay. Phys Rev Lett 2023; 130:151903. [PMID: 37115880 DOI: 10.1103/physrevlett.130.151903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 03/15/2023] [Indexed: 06/19/2023]
Abstract
Using the data sample of 980 fb^{-1} collected with the Belle detector operating at the KEKB asymmetric-energy e^{+}e^{-} collider, we present the results of an investigation of the Λπ^{+} and Λπ^{-} invariant mass distributions looking for substructure in the decay Λ_{c}^{+}→Λπ^{+}π^{+}π^{-}. We find a significant signal in each mass distribution. When interpreted as resonances, we find for the Λπ^{+} (Λπ^{-}) combination a mass of 1434.3±0.6(stat)±0.9(syst) MeV/c^{2} [1438.5±0.9(stat)±2.5(syst) MeV/c^{2}], an intrinsic width of 11.5±2.8(stat)±5.3(syst) MeV/c^{2} [33.0±7.5(stat)±23.6(syst) MeV/c^{2}] with a significance of 7.5σ (6.2σ). As these two signals are very close to the K[over ¯]N threshold, we also investigate the possibility of a K[over ¯]N cusp, and find that we cannot discriminate between these two interpretations due to the limited size of the data sample.
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Lin C, Ahn JK, Choi JM, Farrington MS, Gonzalez M, Grethen N, Hsiung YB, Inagaki T, Kamiji I, Kim EJ, Kim JL, Kim HM, Kawata K, Kitagawa A, Komatsubara TK, Kotera K, Lee SK, Lee JW, Lim GY, Luo Y, Matsumura T, Nakagiri K, Nanjo H, Nomura T, Ono K, Redeker JC, Sato T, Sasse V, Shibata T, Shimizu N, Shinkawa T, Shinohara S, Shiomi K, Shiraishi R, Suzuki S, Tajima Y, Tung YC, Wah YW, Watanabe H, Wu T, Yamanaka T, Yoshida HY. Search for the Pair Production of Dark Particles X with K_{L}^{0}→XX, X→γγ. Phys Rev Lett 2023; 130:111801. [PMID: 37001070 DOI: 10.1103/physrevlett.130.111801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 02/08/2023] [Indexed: 06/19/2023]
Abstract
We present the first search for the pair production of dark particles X via K_{L}^{0}→XX with X decaying into two photons using the data collected by the KOTO experiment. No signal was observed in the mass range of 40-110 MeV/c^{2} and 210-240 MeV/c^{2}. This sets upper limits on the branching fractions as B(K_{L}^{0}→XX)<(1-4)×10^{-7} and B(K_{L}^{0}→XX)<(1-2)×10^{-6} at the 90% confidence level for the two mass regions, respectively.
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Affiliation(s)
- C Lin
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - J M Choi
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - M S Farrington
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - M Gonzalez
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Grethen
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y B Hsiung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - T Inagaki
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - I Kamiji
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - E J Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J L Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - H M Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - K Kawata
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - A Kitagawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T K Komatsubara
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Kotera
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S K Lee
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J W Lee
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - G Y Lim
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - Y Luo
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Matsumura
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - K Nakagiri
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nanjo
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Nomura
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Ono
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - J C Redeker
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Sato
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - V Sasse
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Shibata
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Shimizu
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Shinkawa
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - S Shinohara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Shiomi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - R Shiraishi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Suzuki
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - Y Tajima
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - Y-C Tung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Y W Wah
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - H Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - T Wu
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - T Yamanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Y Yoshida
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
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Abudinén F, Aggarwal L, Ahmed H, Ahn JK, Aihara H, Akopov N, Aloisio A, Anh Ky N, Asner DM, Atmacan H, Aushev T, Aushev V, Babu V, Bae H, Bambade P, Banerjee S, Bansal S, Baudot J, Bauer M, Baur A, Beaubien A, Becker J, Bennett JV, Bernieri E, Bernlochner FU, Bertacchi V, Bertemes M, Bertholet E, Bessner M, Bettarini S, Bhardwaj V, Bianchi F, Bilka T, Biswas D, Bodrov D, Bolz A, Bonvicini G, Bozek A, Bračko M, Branchini P, Briere RA, Browder TE, Budano A, Bussino S, Campajola M, Cao L, Casarosa G, Cecchi C, Chang MC, Chang P, Cheaib R, Cheema P, Chen C, Chen YQ, Chen YT, Cheon BG, Chilikin K, Chirapatpimol K, Cho HE, Cho K, Cho SJ, Choi SK, Choudhury S, Cinabro D, Corona L, Cremaldi LM, Cunliffe S, Dattola F, De La Cruz-Burelo E, De La Motte SA, De Nardo G, De Nuccio M, De Pietro G, de Sangro R, Destefanis M, De Yta-Hernandez A, Dhamija R, Di Canto A, Di Capua F, Dingfelder J, Doležal Z, Domínguez Jiménez I, Dong TV, Dorigo M, Dort K, Dossett D, Dreyer S, Dujany G, Eliachevitch M, Epifanov D, Feichtinger P, Ferber T, Ferlewicz D, Fillinger T, Finocchiaro G, Flood K, Fodor A, Forti F, Frey A, Fulsom BG, Gabrielli A, Ganiev E, Garcia-Hernandez M, Gaz A, Gellrich A, Ghevondyan G, Giordano R, Giri A, Glazov A, Gobbo B, Godang R, Goldenzweig P, Gradl W, Granderath S, Greenwald D, Gu T, Guan Y, Gudkova K, Guilliams J, Halder S, Hara K, Hartbrich O, Hayasaka K, Hayashii H, Hazra S, Hearty C, Heredia de la Cruz I, Hernández Villanueva M, Hershenhorn A, Higuchi T, Hohmann M, Humair T, Iijima T, Inami K, Inguglia G, Ipsita N, Ishikawa A, Ito S, Itoh R, Iwasaki M, Iwasaki Y, Jackson P, Jacobs WW, Jaffe DE, Ji QP, Jin Y, Junkerkalefeld H, Kaleta M, Kandra J, Kang KH, Karl R, Karyan G, Kiesling C, Kim CH, Kim DY, Kim KH, Kim YK, Kindo H, Kinoshita K, Kodyš P, Koga T, Kohani S, Kojima K, Korobov A, Korpar S, Kovalenko E, Kowalewski R, Kraetzschmar TMG, Križan P, Krokovny P, Kuhr T, Kumar J, Kumar R, Kumara K, Kunigo T, Kwon YJ, Lacaprara S, Lam T, Lanceri L, Lange JS, Laurenza M, Leboucher R, Lee SC, Leitl P, Levit D, Li LK, Li SX, Li YB, Libby J, Liptak Z, Liu QY, Liventsev D, Longo S, Lueck T, Lyu C, Maggiora M, Maiti R, Maity S, Manfredi R, Manoni E, Marcello S, Marinas C, Martel L, Martini A, Massaccesi L, Masuda M, Matsuoka K, Matvienko D, McKenna JA, Meier F, Merola M, Milesi M, Miller C, Miyabayashi K, Mohanty GB, Molina-Gonzalez N, Moneta S, Moon H, Moser HG, Mrvar M, Mussa R, Nakamura I, Nakao M, Nakayama H, Narimani Charan A, Naruki M, Natkaniec Z, Natochii A, Nayak L, Nayak M, Nazaryan G, Niebuhr C, Nisar NK, Nishida S, Nishimura K, Ono H, Oskin P, Oxford ER, Pakhlova G, Paladino A, Panta A, Paoloni E, Pardi S, Parham K, Park H, Park SH, Passeri A, Pedlar TK, Peruzzi I, Peschke R, Pestotnik R, Pham F, Piilonen LE, Pinna Angioni G, Podesta-Lerma PLM, Podobnik T, Pokharel S, Polat L, Praz C, Prell S, Prencipe E, Prim MT, Purwar H, Rad N, Rados P, Raiz S, Reif M, Reiter S, Ripp-Baudot I, Rizzo G, Robertson SH, Roney JM, Rostomyan A, Rout N, Russo G, Sanders DA, Sandilya S, Sangal A, Santelj L, Sato Y, Savinov V, Scavino B, Schwanda C, Schwartz AJ, Seino Y, Selce A, Senyo K, Serrano J, Sfienti C, Shen CP, Shillington T, Shiu JG, Sibidanov A, Simon F, Sobie RJ, Soffer A, Sokolov A, Solovieva E, Spataro S, Spruck B, Starič M, Stefkova S, Stroili R, Strube J, Sumihama M, Sumisawa K, Sutcliffe W, Suzuki SY, Svidras H, Takahashi M, Takizawa M, Tamponi U, Tanaka S, Tanida K, Tanigawa H, Taniguchi N, Tenchini F, Tiwary R, Tonelli D, Torassa E, Toutounji N, Trabelsi K, Uchida M, Unger K, Unno Y, Uno K, Uno S, Urquijo P, Ushiroda Y, Vahsen SE, van Tonder R, Varner GS, Varvell KE, Vinokurova A, Vitale L, Vobbilisetti V, Waheed E, Wakeling HM, Wang E, Wang MZ, Wang XL, Warburton A, Watanuki S, Welsch M, Wessel C, Wiechczynski J, Windel H, Won E, Xu XP, Yabsley BD, Yamada S, Yang SB, Ye H, Yelton J, Yin JH, Yoshihara K, Yusa Y, Zhang Y, Zhilich V, Zhou QD, Zhukova VI, Žlebčík R. Measurement of the Λ_{c}^{+} Lifetime. Phys Rev Lett 2023; 130:071802. [PMID: 36867815 DOI: 10.1103/physrevlett.130.071802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 07/25/2022] [Indexed: 06/18/2023]
Abstract
An absolute measurement of the Λ_{c}^{+} lifetime is reported using Λ_{c}^{+}→pK^{-}π^{+} decays in events reconstructed from data collected by the Belle II experiment at the SuperKEKB asymmetric-energy electron-positron collider. The total integrated luminosity of the data sample, which was collected at center-of-mass energies at or near the ϒ(4S) resonance, is 207.2 fb^{-1}. The result, τ(Λ_{c}^{+})=203.20±0.89±0.77 fs, where the first uncertainty is statistical and the second systematic, is the most precise measurement to date and is consistent with previous determinations.
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Miwa K, Ahn JK, Akazawa Y, Aramaki T, Ashikaga S, Callier S, Chiga N, Choi SW, Ekawa H, Evtoukhovitch P, Fujioka N, Fujita M, Gogami T, Harada T, Hasegawa S, Hayakawa SH, Honda R, Hoshino S, Hosomi K, Ichikawa M, Ichikawa Y, Ieiri M, Ikeda M, Imai K, Ishikawa Y, Ishimoto S, Jung WS, Kajikawa S, Kanauchi H, Kanda H, Kitaoka T, Kang BM, Kawai H, Kim SH, Kobayashi K, Koike T, Matsuda K, Matsumoto Y, Nagao S, Nagatomi R, Nakada Y, Nakagawa M, Nakamura I, Nanamura T, Naruki M, Ozawa S, Raux L, Rogers TG, Sakaguchi A, Sakao T, Sako H, Sato S, Shiozaki T, Shirotori K, Suzuki KN, Suzuki S, Tabata M, Taille CDL, Takahashi H, Takahashi T, Takahashi TN, Tamura H, Tanaka M, Tanida K, Tsamalaidze Z, Ukai M, Umetsu H, Wada S, Yamamoto TO, Yoshida J, Yoshimura K. Precise Measurement of Differential Cross Sections of the Σ^{-}p→Λn Reaction in Momentum Range 470-650 MeV/c. Phys Rev Lett 2022; 128:072501. [PMID: 35244436 DOI: 10.1103/physrevlett.128.072501] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/13/2022] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
The differential cross sections of the Σ^{-}p→Λn reaction were measured accurately for the Σ^{-} momentum (p_{Σ}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Facility. Precise angular information about the Σ^{-}p→Λn reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of Δcosθ=0.1. The obtained differential cross sections show a slightly forward-peaking structure in the measured momentum regions. The cross sections integrated for -0.7≤cosθ≤1.0 were obtained as 22.5±0.68 [statistical error(stat.)] ±0.65 [systematic error(syst.)] mb and 15.8±0.83(stat)±0.52(syst) mb for 470<p_{Σ}(MeV/c)<550 and 550<p_{Σ}(MeV/c)<650, respectively. These results show a drastic improvement compared with past measurements of the hyperon-proton scattering experiments. They will play essential roles in updating the theoretical models of the baryon-baryon interactions.
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Affiliation(s)
- K Miwa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Korea
| | - Y Akazawa
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Aramaki
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S Ashikaga
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Callier
- OMEGA Ecole Polytechnique-CNRS/IN2P3, 3 rue Michel-Ange, 75794 Paris 16, France
| | - N Chiga
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S W Choi
- Department of Physics, Korea University, Seoul 02841, Korea
| | - H Ekawa
- High Energy Nuclear Physics Laboratory, RIKEN, Wako 351-0198, Japan
| | - P Evtoukhovitch
- Joint Institute for Nuclear Research (JINR), Dubna, Moscow Region 141980, Russia
| | - N Fujioka
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - M Fujita
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - T Gogami
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Harada
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Hasegawa
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - S H Hayakawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - R Honda
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - S Hoshino
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - K Hosomi
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - M Ichikawa
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
- Meson Science Laboratory, Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - Y Ichikawa
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - M Ieiri
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - M Ikeda
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Imai
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - Y Ishikawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S Ishimoto
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - W S Jung
- Department of Physics, Korea University, Seoul 02841, Korea
| | - S Kajikawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - H Kanauchi
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - H Kanda
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
| | - T Kitaoka
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - B M Kang
- Department of Physics, Korea University, Seoul 02841, Korea
| | - H Kawai
- Department of Physics, Chiba University, Chiba 263-8522, Japan
| | - S H Kim
- Department of Physics, Korea University, Seoul 02841, Korea
| | - K Kobayashi
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - T Koike
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Matsuda
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - Y Matsumoto
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S Nagao
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - R Nagatomi
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - Y Nakada
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - M Nakagawa
- High Energy Nuclear Physics Laboratory, RIKEN, Wako 351-0198, Japan
| | - I Nakamura
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Nanamura
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - M Naruki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Ozawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - L Raux
- OMEGA Ecole Polytechnique-CNRS/IN2P3, 3 rue Michel-Ange, 75794 Paris 16, France
| | - T G Rogers
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - A Sakaguchi
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - T Sakao
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - H Sako
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - S Sato
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - T Shiozaki
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Shirotori
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
| | - K N Suzuki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Suzuki
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - M Tabata
- Department of Physics, Chiba University, Chiba 263-8522, Japan
| | - C D L Taille
- OMEGA Ecole Polytechnique-CNRS/IN2P3, 3 rue Michel-Ange, 75794 Paris 16, France
| | - H Takahashi
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Takahashi
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T N Takahashi
- Nishina Center for Accelerator-based Science, RIKEN, Wako 351-0198, Japan
| | - H Tamura
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - M Tanaka
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - K Tanida
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - Z Tsamalaidze
- Joint Institute for Nuclear Research (JINR), Dubna, Moscow Region 141980, Russia
- Georgian Technical University (GTU), Tbilisi 0175, Georgia
| | - M Ukai
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - H Umetsu
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S Wada
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - T O Yamamoto
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - J Yoshida
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Yoshimura
- Department of Physics, Okayama University, Okayama 700-8530, Japan
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5
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Ahn JK, Beckford B, Campbell M, Chen SH, Comfort J, Dona K, Farrington MS, Hanai K, Hara N, Haraguchi H, Hsiung YB, Hutcheson M, Inagaki T, Isoe M, Kamiji I, Kato T, Kim EJ, Kim JL, Kim HM, Komatsubara TK, Kotera K, Lee SK, Lee JW, Lim GY, Lin QS, Lin C, Luo Y, Mari T, Masuda T, Matsumura T, Mcfarland D, McNeal N, Miyazaki K, Murayama R, Nakagiri K, Nanjo H, Nishimiya H, Noichi Y, Nomura T, Nunes T, Ohsugi M, Okuno H, Redeker JC, Sanchez J, Sasaki M, Sasao N, Sato T, Sato K, Sato Y, Shimizu N, Shimogawa T, Shinkawa T, Shinohara S, Shiomi K, Shiraishi R, Su S, Sugiyama Y, Suzuki S, Tajima Y, Taylor M, Tecchio M, Togawa M, Toyoda T, Tung YC, Vuong QH, Wah YW, Watanabe H, Yamanaka T, Yoshida HY, Zaidenberg L. Study of the K_{L}→π^{0}νν[over ¯] Decay at the J-PARC KOTO Experiment. Phys Rev Lett 2021; 126:121801. [PMID: 33834796 DOI: 10.1103/physrevlett.126.121801] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
The rare decay K_{L}→π^{0}νν[over ¯] was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.05_{stat}±0.66_{syst})×10^{-10}, three candidate events were observed in the signal region. After unveiling them, contaminations from K^{±} and scattered K_{L} decays were studied, and the total number of background events was estimated to be 1.22±0.26. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of 4.9×10^{-9} on the branching fraction of K_{L}→π^{0}νν[over ¯] at the 90% confidence level.
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Affiliation(s)
- J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - B Beckford
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Campbell
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - S H Chen
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - J Comfort
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - K Dona
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M S Farrington
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - K Hanai
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Hara
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Haraguchi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y B Hsiung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - M Hutcheson
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - T Inagaki
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - M Isoe
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - I Kamiji
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Kato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - E J Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J L Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - H M Kim
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - T K Komatsubara
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Kotera
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S K Lee
- Division of Science Education, Jeonbuk National University, Jeonju 54896, Republic of Korea
| | - J W Lee
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - G Y Lim
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - Q S Lin
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - C Lin
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Y Luo
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T Mari
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Masuda
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - T Matsumura
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - D Mcfarland
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - N McNeal
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - K Miyazaki
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - R Murayama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - K Nakagiri
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nanjo
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nishimiya
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Noichi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Nomura
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - T Nunes
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Ohsugi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Okuno
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - J C Redeker
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - J Sanchez
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Sasaki
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - N Sasao
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - T Sato
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - K Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - N Shimizu
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Shimogawa
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - T Shinkawa
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - S Shinohara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Shiomi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - R Shiraishi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Su
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Y Sugiyama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Suzuki
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - Y Tajima
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - M Taylor
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Tecchio
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Togawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Toyoda
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y-C Tung
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Q H Vuong
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y W Wah
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - H Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - T Yamanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Y Yoshida
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - L Zaidenberg
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
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6
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Hayakawa SH, Agari K, Ahn JK, Akaishi T, Akazawa Y, Ashikaga S, Bassalleck B, Bleser S, Ekawa H, Endo Y, Fujikawa Y, Fujioka N, Fujita M, Goto R, Han Y, Hasegawa S, Hashimoto T, Hayakawa T, Hayata E, Hicks K, Hirose E, Hirose M, Honda R, Hoshino K, Hoshino S, Hosomi K, Hwang SH, Ichikawa Y, Ichikawa M, Imai K, Inaba K, Ishikawa Y, Ito H, Ito K, Jung WS, Kanatsuki S, Kanauchi H, Kasagi A, Kawai T, Kim MH, Kim SH, Kinbara S, Kiuchi R, Kobayashi H, Kobayashi K, Koike T, Koshikawa A, Lee JY, Ma TL, Matsumoto SY, Minakawa M, Miwa K, Moe AT, Moon TJ, Moritsu M, Nagase Y, Nakada Y, Nakagawa M, Nakashima D, Nakazawa K, Nanamura T, Naruki M, Nyaw ANL, Ogura Y, Ohashi M, Oue K, Ozawa S, Pochodzalla J, Ryu SY, Sako H, Sato S, Sato Y, Schupp F, Shirotori K, Soe MM, Soe MK, Sohn JY, Sugimura H, Suzuki KN, Takahashi H, Takahashi T, Takeda T, Tamura H, Tanida K, Theint AMM, Tint KT, Toyama Y, Ukai M, Umezaki E, Watabe T, Watanabe K, Yamamoto TO, Yang SB, Yoon CS, Yoshida J, Yoshimoto M, Zhang DH, Zhang Z. Observation of Coulomb-Assisted Nuclear Bound State of Ξ^{-}-^{14}N System. Phys Rev Lett 2021; 126:062501. [PMID: 33635678 DOI: 10.1103/physrevlett.126.062501] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/19/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
In an emulsion-counter hybrid experiment performed at J-PARC, a Ξ^{-} absorption event was observed which decayed into twin single-Λ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as Ξ^{-}+^{14}N→_{Λ}^{10}Be+_{Λ}^{5}He. For the binding energy of the Ξ^{-} hyperon in the Ξ^{-}-^{14}N system a value of 1.27±0.21 MeV was deduced. The energy level of Ξ^{-} is likely a nuclear 1p state which indicates a weak ΞN-ΛΛ coupling.
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Affiliation(s)
- S H Hayakawa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - K Agari
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Korea
| | - T Akaishi
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - Y Akazawa
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - S Ashikaga
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - B Bassalleck
- Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - S Bleser
- Helmholtz Institute Mainz, 55099 Mainz, Germany
| | - H Ekawa
- High Energy Nuclear Physics Laboratory, RIKEN, Wako 351-0198, Japan
| | - Y Endo
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - Y Fujikawa
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - N Fujioka
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - M Fujita
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - R Goto
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - Y Han
- Institute of Nuclear Energy Safety Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
| | - S Hasegawa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - T Hashimoto
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - T Hayakawa
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - E Hayata
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Hicks
- Department of Physics & Astronomy, Ohio University, Athens, Ohio 45701, USA
| | - E Hirose
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - M Hirose
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - R Honda
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - K Hoshino
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - S Hoshino
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - K Hosomi
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - S H Hwang
- Korea Research Institute of Standards and Science, Daejeon 34113, Korea
| | - Y Ichikawa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - M Ichikawa
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
- Meson Science Laboratory, RIKEN, Wako 351-0198, Japan
| | - K Imai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - K Inaba
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Y Ishikawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - H Ito
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - K Ito
- Department of Physics, Nagoya University, Nagoya 464-8601, Japan
| | - W S Jung
- Department of Physics, Korea University, Seoul 02841, Korea
| | - S Kanatsuki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Kanauchi
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - A Kasagi
- High Energy Nuclear Physics Laboratory, RIKEN, Wako 351-0198, Japan
- Graduate School of Engineering, Gifu University, Gifu 501-1193, Japan
| | - T Kawai
- Center for Advanced Photonics, RIKEN, Wako 351-0198, Japan
| | - M H Kim
- Department of Physics, Korea University, Seoul 02841, Korea
| | - S H Kim
- Department of Physics, Korea University, Seoul 02841, Korea
| | - S Kinbara
- Graduate School of Engineering, Gifu University, Gifu 501-1193, Japan
| | - R Kiuchi
- Institute of High Energy Physics, Beijing 100049, China
| | - H Kobayashi
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - K Kobayashi
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - T Koike
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - A Koshikawa
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - J Y Lee
- Department of Physics, Seoul National University, Seoul 08826, Korea
| | - T L Ma
- Institute of Modern Physics, Shanxi Normal University, Linfen 041004, China
| | - S Y Matsumoto
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
- Meson Science Laboratory, RIKEN, Wako 351-0198, Japan
| | - M Minakawa
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - K Miwa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - A T Moe
- Department of Physics, Lashio University, Lashio 06301, Myanmar
| | - T J Moon
- Department of Physics, Seoul National University, Seoul 08826, Korea
| | - M Moritsu
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - Y Nagase
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - Y Nakada
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - M Nakagawa
- High Energy Nuclear Physics Laboratory, RIKEN, Wako 351-0198, Japan
| | - D Nakashima
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - K Nakazawa
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
- Graduate School of Engineering, Gifu University, Gifu 501-1193, Japan
| | - T Nanamura
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - M Naruki
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - A N L Nyaw
- Graduate School of Engineering, Gifu University, Gifu 501-1193, Japan
| | - Y Ogura
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - M Ohashi
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - K Oue
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - S Ozawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - J Pochodzalla
- Helmholtz Institute Mainz, 55099 Mainz, Germany
- Institut fur Kernphysik, Johannes Gutenberg-Universitat, 55099 Mainz, Germany
| | - S Y Ryu
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
| | - H Sako
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - S Sato
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - Y Sato
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - F Schupp
- Helmholtz Institute Mainz, 55099 Mainz, Germany
| | - K Shirotori
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
| | - M M Soe
- Department of Physics, University of Yangon, Yangon 11041, Myanmar
| | - M K Soe
- Graduate School of Engineering, Gifu University, Gifu 501-1193, Japan
| | - J Y Sohn
- Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Korea
| | - H Sugimura
- Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - K N Suzuki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Takahashi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Takahashi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Takeda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Tamura
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - A M M Theint
- Graduate School of Engineering, Gifu University, Gifu 501-1193, Japan
| | - K T Tint
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - Y Toyama
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - M Ukai
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - E Umezaki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Watabe
- Department of Physics, Nagoya University, Nagoya 464-8601, Japan
| | - K Watanabe
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T O Yamamoto
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - S B Yang
- Department of Physics, Korea University, Seoul 02841, Korea
| | - C S Yoon
- Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Korea
| | - J Yoshida
- High Energy Nuclear Physics Laboratory, RIKEN, Wako 351-0198, Japan
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - M Yoshimoto
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - D H Zhang
- Institute of Modern Physics, Shanxi Normal University, Linfen 041004, China
| | - Z Zhang
- Institute of Modern Physics, Shanxi Normal University, Linfen 041004, China
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7
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Tomida N, Muramatsu N, Niiyama M, Ahn JK, Chang WC, Chen JY, Chu ML, Daté S, Gogami T, Goto H, Hamano H, Hashimoto T, He QH, Hicks K, Hiraiwa T, Honda Y, Hotta T, Ikuno H, Inoue Y, Ishikawa T, Jaegle I, Jo JM, Kasamatsu Y, Katsuragawa H, Kido S, Kon Y, Maruyama T, Masumoto S, Matsumura Y, Miyabe M, Mizutani K, Nagahiro H, Nakamura T, Nakano T, Nam T, Ngan TNT, Nozawa Y, Ohashi Y, Ohnishi H, Ohta T, Ozawa K, Rangacharyulu C, Ryu SY, Sada Y, Sasagawa M, Shibukawa T, Shimizu H, Shirai R, Shiraishi K, Strokovsky EA, Sugaya Y, Sumihama M, Suzuki S, Tanaka S, Tokiyasu A, Tsuchikawa Y, Ueda T, Yamazaki H, Yamazaki R, Yanai Y, Yorita T, Yoshida C, Yosoi M. Search for η^{'} Bound Nuclei in the ^{12}C(γ,p) Reaction with Simultaneous Detection of Decay Products. Phys Rev Lett 2020; 124:202501. [PMID: 32501086 DOI: 10.1103/physrevlett.124.202501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 02/11/2020] [Accepted: 04/30/2020] [Indexed: 06/11/2023]
Abstract
We measured missing mass spectrum of the ^{12}C(γ,p) reaction for the first time in coincidence with potential decay products from η^{'} bound nuclei. We tagged an (η+p) pair associated with the η^{'}N→ηN process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle cosθ_{lab}^{ηp}<-0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η^{'} production rate. Our results indicate a small branching fraction of the η^{'}N→ηN process and/or a shallow η^{'}-nucleus potential.
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Affiliation(s)
- N Tomida
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - N Muramatsu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - M Niiyama
- Department of Physics, Kyoto Sangyo University, Kyoto 603-8555, Japan
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - W C Chang
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - J Y Chen
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - M L Chu
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - S Daté
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Japan Synchrotron Radiation Research Institute (SPring-8), Sayo, Hyogo 679-5198, Japan
| | - T Gogami
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Goto
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Hamano
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Hashimoto
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Q H He
- Department of Nuclear Science & Engineering, College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - K Hicks
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
| | - T Hiraiwa
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - Y Honda
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - T Hotta
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Ikuno
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Y Inoue
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - T Ishikawa
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - I Jaegle
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - J M Jo
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - Y Kasamatsu
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Katsuragawa
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S Kido
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - Y Kon
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Institute for Radiation Sciences, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Maruyama
- College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa 252-8510, Japan
| | - S Masumoto
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - Y Matsumura
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - M Miyabe
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - K Mizutani
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - H Nagahiro
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Department of Physics, Nara Women's University, Nara 630-8506, Japan
| | - T Nakamura
- Department of Education, Gifu University, Gifu 501-1193, Japan
| | - T Nakano
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Nam
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T N T Ngan
- Nuclear Physics Department, University of Science, Vietnam National University, Ho Chi Minh City 72711, Vietnam
| | - Y Nozawa
- Department of Radiology, The University of Tokyo Hospital, Tokyo 113-8655, Japan
| | - Y Ohashi
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Ohnishi
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - T Ohta
- Department of Radiology, The University of Tokyo Hospital, Tokyo 113-8655, Japan
| | - K Ozawa
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - C Rangacharyulu
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon SK S7N 5E2, Canada
| | - S Y Ryu
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Y Sada
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - M Sasagawa
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - T Shibukawa
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - H Shimizu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - R Shirai
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - K Shiraishi
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - E A Strokovsky
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Laboratory of High Energy Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region 142281, Russia
| | - Y Sugaya
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - M Sumihama
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Department of Education, Gifu University, Gifu 501-1193, Japan
| | - S Suzuki
- Japan Synchrotron Radiation Research Institute (SPring-8), Sayo, Hyogo 679-5198, Japan
| | - S Tanaka
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - A Tokiyasu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - Y Tsuchikawa
- J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - T Ueda
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - H Yamazaki
- Radiation Science Center, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1195, Japan
| | - R Yamazaki
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - Y Yanai
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Yorita
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - C Yoshida
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - M Yosoi
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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8
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Lugendo IJ, Ahn JK, Kumwenda MJ, Lee JW, Hong B, Hwang SH. Lifetime measurement of the first excited 5/2 + state in 133Cs using NaI(Tl) and LaBr 3(Ce) detectors. Appl Radiat Isot 2019; 150:141-145. [PMID: 31146218 DOI: 10.1016/j.apradiso.2019.05.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 04/05/2019] [Accepted: 05/16/2019] [Indexed: 10/26/2022]
Abstract
We report a new high-precision lifetime measurement of the first excited 5/2+ state of 133Cs using NaI(Tl) and LaBr3(Ce) detectors. The time difference between the coincident decays of two successive states was measured using fast-timing electronics. The 356-keV (1/2+→5/2+) gamma transition was tagged by the successive 81-keV (5/2+→7/2+) transition of 133Cs. The half-life of the first excited 5/2+133Cs state was measured as T1/2=6.283±0.004 (stat.) ±0.011(syst.) ns.
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Affiliation(s)
- I J Lugendo
- Department of Physics, University of Dar Es Salaam, P.O. Box 35063, Dar Es Salaam, United Republic of Tanzania
| | - J K Ahn
- Department of Physics, Korea University, Seoul, 02841, Republic of Korea.
| | - M J Kumwenda
- Department of Physics, University of Dar Es Salaam, P.O. Box 35063, Dar Es Salaam, United Republic of Tanzania
| | - J W Lee
- Department of Physics, Korea University, Seoul, 02841, Republic of Korea
| | - B Hong
- Department of Physics, Korea University, Seoul, 02841, Republic of Korea
| | - S H Hwang
- Korea Research Institute of Standards and Science (KRISS), Daejeon, 34113, Republic of Korea
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9
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Sumihama M, Adachi I, Ahn JK, Aihara H, Al Said S, Asner DM, Atmacan H, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Bakich AM, Bansal V, Beleño C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bonvicini G, Bozek A, Bračko M, Browder TE, Červenkov D, Chekelian V, Chen A, Cheon BG, Chilikin K, Cho K, Choi SK, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Czank T, Dash N, Di Carlo S, Doležal Z, Dong TV, Drásal Z, Eidelman S, Epifanov D, Fast JE, Fulsom BG, Garg R, Gaur V, Gabyshev N, Garmash A, Gelb M, Giri A, Goldenzweig P, Guido E, Haba J, Hayasaka K, Hayashii H, Hirose S, Hou WS, Inami K, Inguglia G, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Jacobs WW, Jeon HB, Jia S, Jin Y, Joo KK, Julius T, Kaliyar AB, Kang KH, Karyan G, Kato Y, Kiesling C, Kim DY, Kim JB, Kim KT, Kim SH, Kinoshita K, Kodyš P, Korpar S, Kotchetkov D, Križan P, Kroeger R, Krokovny P, Kumar R, Kuzmin A, Kwon YJ, Lange JS, Lee IS, Lee SC, Li LK, Li YB, Li Gioi L, Libby J, Liventsev D, Lubej M, Luo T, Masuda M, Matsuda T, Matvienko D, Merola M, Miyabayashi K, Miyata H, Mizuk R, Mohanty GB, Moon HK, Mori T, Mussa R, Nakano E, Nakano T, Nakao M, Nanut T, Nath KJ, Natkaniec Z, Niiyama M, Nisar NK, Nishida S, Ono H, Pakhlov P, Pakhlova G, Pal B, Pardi S, Park H, Paul S, Pedlar TK, Pestotnik R, Piilonen LE, Popov V, Ritter M, Russo G, Sahoo D, Sandilya S, Santelj L, Sanuki T, Savinov V, Schneider O, Schnell G, Schwanda C, Seino Y, Senyo K, Sevior ME, Shebalin V, Shen CP, Shibata TA, Shiu JG, Shwartz B, Simon F, Sokolov A, Solovieva E, Starič M, Strube JF, Sumiyoshi T, Takizawa M, Tamponi U, Tanida K, Taniguchi N, Tenchini F, Uchida M, Uglov T, Uno S, Urquijo P, Vahsen SE, Van Hulse C, Varner G, Vorobyev V, Vossen A, Wang B, Wang CH, Wang MZ, Wang P, Wang XL, Watanabe M, Watanuki S, Widmann E, Won E, Ye H, Yelton J, Yuan CZ, Yusa Y, Zakharov S, Zhang ZP, Zhilich V, Zhukova V, Zhulanov V. Observation of Ξ(1620)^{0} and Evidence for Ξ(1690)^{0} in Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} Decays. Phys Rev Lett 2019; 122:072501. [PMID: 30848612 DOI: 10.1103/physrevlett.122.072501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 01/08/2019] [Indexed: 06/09/2023]
Abstract
We report the first observation of the double strange baryon Ξ(1620)^{0} in its decay to Ξ^{-}π^{+} via Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} decays based on a 980 fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The mass and width are measured to be 1610.4±6.0(stat)_{-4.2}^{+6.1} (syst) MeV/c^{2} and 59.9±4.8(stat)_{-7.1}^{+2.8}(syst) MeV, respectively. We obtain 4.0σ evidence of the Ξ(1690)^{0} with the same data sample. These results shed light on the structure of hyperon resonances with strangeness S=-2.
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Affiliation(s)
- M Sumihama
- Gifu University, Gifu 501-1193
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047
| | - I Adachi
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - J K Ahn
- Korea University, Seoul 136-713
| | - H Aihara
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - S Al Said
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - D M Asner
- Brookhaven National Laboratory, Upton, New York 11973
| | - H Atmacan
- University of South Carolina, Columbia, South Carolina 29208
| | - T Aushev
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - R Ayad
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - V Babu
- Tata Institute of Fundamental Research, Mumbai 400005
| | - I Badhrees
- King Abdulaziz City for Science and Technology, Riyadh 11442
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - S Bahinipati
- Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
| | - A M Bakich
- School of Physics, University of Sydney, Sydney, New South Wales 2006
| | - V Bansal
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - C Beleño
- II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen
| | - M Berger
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - V Bhardwaj
- Indian Institute of Science Education and Research Mohali, SAS Nagar, Mohali 140306
| | - B Bhuyan
- Indian Institute of Technology Guwahati, Assam 781039
| | - T Bilka
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - J Biswal
- J. Stefan Institute, 1000 Ljubljana
| | - G Bonvicini
- Wayne State University, Detroit, Michigan 48202
| | - A Bozek
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
| | - M Bračko
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | - T E Browder
- University of Hawaii, Honolulu, Hawaii 96822
| | - D Červenkov
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - V Chekelian
- Max-Planck-Institut für Physik, 80805 München
| | - A Chen
- National Central University, Chung-li 32054
| | | | - K Chilikin
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | - K Cho
- Korea Institute of Science and Technology Information, Daejeon 305-806
| | - S-K Choi
- Gyeongsang National University, Chinju 660-701
| | - Y Choi
- Sungkyunkwan University, Suwon 440-746
| | - S Choudhury
- Indian Institute of Technology Hyderabad, Telangana 502285
| | - D Cinabro
- Wayne State University, Detroit, Michigan 48202
| | - S Cunliffe
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - T Czank
- Department of Physics, Tohoku University, Sendai 980-8578
| | - N Dash
- Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
| | - S Di Carlo
- LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay
| | - Z Doležal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - T V Dong
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - Z Drásal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - S Eidelman
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - D Epifanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - J E Fast
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - B G Fulsom
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - R Garg
- Panjab University, Chandigarh 160014
| | - V Gaur
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - N Gabyshev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - A Garmash
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - M Gelb
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - A Giri
- Indian Institute of Technology Hyderabad, Telangana 502285
| | - P Goldenzweig
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - E Guido
- INFN-Sezione di Torino, 10125 Torino
| | - J Haba
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | | | | | - S Hirose
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - W-S Hou
- Department of Physics, National Taiwan University, Taipei 10617
| | - K Inami
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - G Inguglia
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - A Ishikawa
- Department of Physics, Tohoku University, Sendai 980-8578
| | - R Itoh
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - M Iwasaki
- Osaka City University, Osaka 558-8585
| | - Y Iwasaki
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - W W Jacobs
- Indiana University, Bloomington, Indiana 47408
| | - H B Jeon
- Kyungpook National University, Daegu 702-701
| | - S Jia
- Beihang University, Beijing 100191
| | - Y Jin
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - K K Joo
- Chonnam National University, Kwangju 660-701
| | - T Julius
- School of Physics, University of Melbourne, Victoria 3010
| | - A B Kaliyar
- Indian Institute of Technology Madras, Chennai 600036
| | - K H Kang
- Kyungpook National University, Daegu 702-701
| | - G Karyan
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - Y Kato
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
| | - C Kiesling
- Max-Planck-Institut für Physik, 80805 München
| | - D Y Kim
- Soongsil University, Seoul 156-743
| | - J B Kim
- Korea University, Seoul 136-713
| | - K T Kim
- Korea University, Seoul 136-713
| | - S H Kim
- Hanyang University, Seoul 133-791
| | - K Kinoshita
- University of Cincinnati, Cincinnati, Ohio 45221
| | - P Kodyš
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - S Korpar
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | | | - P Križan
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
| | - R Kroeger
- University of Mississippi, University, Mississippi 38677
| | - P Krokovny
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - R Kumar
- Punjab Agricultural University, Ludhiana 141004
| | - A Kuzmin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - Y-J Kwon
- Yonsei University, Seoul 120-749
| | - J S Lange
- Justus-Liebig-Universität Gießen, 35392 Gießen
| | - I S Lee
- Hanyang University, Seoul 133-791
| | - S C Lee
- Kyungpook National University, Daegu 702-701
| | - L K Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - Y B Li
- Peking University, Beijing 100871
| | - L Li Gioi
- Max-Planck-Institut für Physik, 80805 München
| | - J Libby
- Indian Institute of Technology Madras, Chennai 600036
| | - D Liventsev
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - M Lubej
- J. Stefan Institute, 1000 Ljubljana
| | - T Luo
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - M Masuda
- Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
| | - T Matsuda
- University of Miyazaki, Miyazaki 889-2192
| | - D Matvienko
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - M Merola
- INFN-Sezione di Napoli, 80126 Napoli
- Università di Napoli Federico II, 80055 Napoli
| | | | - H Miyata
- Niigata University, Niigata 950-2181
| | - R Mizuk
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - G B Mohanty
- Tata Institute of Fundamental Research, Mumbai 400005
| | | | - T Mori
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - R Mussa
- INFN-Sezione di Torino, 10125 Torino
| | - E Nakano
- Osaka City University, Osaka 558-8585
| | - T Nakano
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047
| | - M Nakao
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - T Nanut
- J. Stefan Institute, 1000 Ljubljana
| | - K J Nath
- Indian Institute of Technology Guwahati, Assam 781039
| | - Z Natkaniec
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
| | | | - N K Nisar
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - S Nishida
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - H Ono
- Nippon Dental University, Niigata 951-8580
- Niigata University, Niigata 950-2181
| | - P Pakhlov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
| | - G Pakhlova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - B Pal
- Brookhaven National Laboratory, Upton, New York 11973
| | - S Pardi
- INFN-Sezione di Napoli, 80126 Napoli
| | - H Park
- Kyungpook National University, Daegu 702-701
| | - S Paul
- Department of Physics, Technische Universität München, 85748 Garching
| | | | | | - L E Piilonen
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - V Popov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - M Ritter
- Ludwig Maximilians University, 80539 Munich
| | - G Russo
- INFN-Sezione di Napoli, 80126 Napoli
| | - D Sahoo
- Tata Institute of Fundamental Research, Mumbai 400005
| | - S Sandilya
- University of Cincinnati, Cincinnati, Ohio 45221
| | - L Santelj
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - T Sanuki
- Department of Physics, Tohoku University, Sendai 980-8578
| | - V Savinov
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - O Schneider
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
| | - G Schnell
- University of the Basque Country UPV/EHU, 48080 Bilbao
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao
| | - C Schwanda
- Institute of High Energy Physics, Vienna 1050
| | - Y Seino
- Niigata University, Niigata 950-2181
| | - K Senyo
- Yamagata University, Yamagata 990-8560
| | - M E Sevior
- School of Physics, University of Melbourne, Victoria 3010
| | - V Shebalin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - C P Shen
- Beihang University, Beijing 100191
| | - T-A Shibata
- Tokyo Institute of Technology, Tokyo 152-8550
| | - J-G Shiu
- Department of Physics, National Taiwan University, Taipei 10617
| | - B Shwartz
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - F Simon
- Max-Planck-Institut für Physik, 80805 München
- Excellence Cluster Universe, Technische Universität München, 85748 Garching
| | - A Sokolov
- Institute for High Energy Physics, Protvino 142281
| | - E Solovieva
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - M Starič
- J. Stefan Institute, 1000 Ljubljana
| | - J F Strube
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - T Sumiyoshi
- Tokyo Metropolitan University, Tokyo 192-0397
| | - M Takizawa
- J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198
- Showa Pharmaceutical University, Tokyo 194-8543
| | - U Tamponi
- INFN-Sezione di Torino, 10125 Torino
| | - K Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
| | - N Taniguchi
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - F Tenchini
- School of Physics, University of Melbourne, Victoria 3010
| | - M Uchida
- Tokyo Institute of Technology, Tokyo 152-8550
| | - T Uglov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - S Uno
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - P Urquijo
- School of Physics, University of Melbourne, Victoria 3010
| | - S E Vahsen
- University of Hawaii, Honolulu, Hawaii 96822
| | - C Van Hulse
- University of the Basque Country UPV/EHU, 48080 Bilbao
| | - G Varner
- University of Hawaii, Honolulu, Hawaii 96822
| | - V Vorobyev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - A Vossen
- Duke University, Durham, North Carolina 27708
| | - B Wang
- University of Cincinnati, Cincinnati, Ohio 45221
| | - C H Wang
- National United University, Miao Li 36003
| | - M-Z Wang
- Department of Physics, National Taiwan University, Taipei 10617
| | - P Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - X L Wang
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | | | - S Watanuki
- Department of Physics, Tohoku University, Sendai 980-8578
| | - E Widmann
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - E Won
- Korea University, Seoul 136-713
| | - H Ye
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - J Yelton
- University of Florida, Gainesville, Florida 32611
| | - C Z Yuan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - Y Yusa
- Niigata University, Niigata 950-2181
| | - S Zakharov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - Z P Zhang
- University of Science and Technology of China, Hefei 230026
| | - V Zhilich
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - V Zhukova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
| | - V Zhulanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
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Guan Y, Vossen A, Adachi I, Adamczyk K, Ahn JK, Aihara H, Al Said S, Asner DM, Atmacan H, Aulchenko V, Aushev T, Ayad R, Babu V, Badhrees I, Bakich AM, Bansal V, Behera P, Beleño C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bobrov A, Bonvicini G, Bozek A, Bračko M, Browder TE, Cao L, Červenkov D, Chang P, Chekelian V, Chen A, Cheon BG, Chilikin K, Cho K, Choi SK, Choi Y, Cinabro D, Cunliffe S, Dash N, Di Carlo S, Dingfelder J, Doležal Z, Dong TV, Drásal Z, Eidelman S, Epifanov D, Fast JE, Ferber T, Fulsom BG, Garg R, Gaur V, Gabyshev N, Garmash A, Gelb M, Giri A, Goldenzweig P, Golob B, Guido E, Haba J, Hayasaka K, Hayashii H, Hirose S, Hou WS, Iijima T, Inami K, Inguglia G, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Jacobs WW, Jaegle I, Jeon HB, Jia S, Jin Y, Joffe D, Joo KK, Julius T, Kang KH, Kawasaki T, Kiesling C, Kim DY, Kim HJ, Kim JB, Kim KT, Kim SH, Kinoshita K, Kodyš P, Korpar S, Kotchetkov D, Križan P, Kroeger R, Krokovny P, Kuhr T, Kulasiri R, Kuzmin A, Kwon YJ, Lange JS, Lee IS, Lee SC, Li LK, Li YB, Li Gioi L, Libby J, Liventsev D, Lubej M, Luo T, Masuda M, Matsuda T, Matvienko D, Merola M, Miyata H, Mizuk R, Mohanty GB, Moon HK, Mori T, Mussa R, Nakao M, Nanut T, Nath KJ, Natkaniec Z, Nayak M, Niiyama M, Nisar NK, Nishida S, Ogawa S, Okuno S, Ono H, Pakhlov P, Pakhlova G, Pal B, Pardi S, Park H, Paul S, Pedlar TK, Pestotnik R, Piilonen LE, Popov V, Prencipe E, Rabusov A, Rostomyan A, Russo G, Sahoo D, Sakai Y, Salehi M, Sandilya S, Santelj L, Sanuki T, Savinov V, Schneider O, Schnell G, Schwanda C, Seidl R, Seino Y, Senyo K, Seon O, Sevior ME, Shebalin V, Shen CP, Shibata TA, Shiu JG, Simon F, Sokolov A, Solovieva E, Starič M, Strube JF, Sumihama M, Sumiyoshi T, Sutcliffe W, Suzuki K, Takizawa M, Tamponi U, Tanida K, Tenchini F, Uchida M, Uglov T, Unno Y, Uno S, Urquijo P, Usov Y, Vahsen SE, Van Hulse C, Van Tonder R, Varner G, Vinokurova A, Vorobyev V, Waheed E, Wang B, Wang CH, Wang MZ, Wang P, Wang XL, Watanuki S, Widmann E, Won E, Ye H, Yelton J, Yin JH, Yuan CZ, Yusa Y, Zhang ZP, Zhilich V, Zhukova V, Zhulanov V, Zupanc A. Observation of Transverse Λ/Λ[over ¯] Hyperon Polarization in e^{+}e^{-} Annihilation at Belle. Phys Rev Lett 2019; 122:042001. [PMID: 30768311 DOI: 10.1103/physrevlett.122.042001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 12/21/2018] [Indexed: 06/09/2023]
Abstract
We report the first observation of the spontaneous polarization of Λ and Λ[over ¯] hyperons transverse to the production plane in e^{+}e^{-} annihilation, which is attributed to the effect arising from a polarizing fragmentation function. For inclusive Λ/Λ[over ¯] production, we also report results with subtracted feed-down contributions from Σ^{0} and charm. This measurement uses a dataset of 800.4 fb^{-1} collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV. We observe a significant polarization that rises with the fractional energy carried by the Λ/Λ[over ¯] hyperon.
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Affiliation(s)
- Y Guan
- Duke University, Durham, North Carolina 27708
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Indiana University, Bloomington, Indiana 47408
| | - A Vossen
- Duke University, Durham, North Carolina 27708
- Indiana University, Bloomington, Indiana 47408
| | - I Adachi
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - K Adamczyk
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
| | - J K Ahn
- Korea University, Seoul 136-713
| | - H Aihara
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - S Al Said
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - D M Asner
- Brookhaven National Laboratory, Upton, New York 11973
| | - H Atmacan
- University of South Carolina, Columbia, South Carolina 29208
| | - V Aulchenko
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - T Aushev
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - R Ayad
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - V Babu
- Tata Institute of Fundamental Research, Mumbai 400005
| | - I Badhrees
- King Abdulaziz City for Science and Technology, Riyadh 11442
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - A M Bakich
- School of Physics, University of Sydney, New South Wales 2006
| | - V Bansal
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - P Behera
- Indian Institute of Technology Madras, Chennai 600036
| | - C Beleño
- II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen
| | - M Berger
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - V Bhardwaj
- Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
| | - B Bhuyan
- Indian Institute of Technology Guwahati, Assam 781039
| | - T Bilka
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - J Biswal
- J. Stefan Institute, 1000 Ljubljana
| | - A Bobrov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - G Bonvicini
- Wayne State University, Detroit, Michigan 48202
| | - A Bozek
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
| | - M Bračko
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | - T E Browder
- University of Hawaii, Honolulu, Hawaii 96822
| | - L Cao
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - D Červenkov
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - P Chang
- Department of Physics, National Taiwan University, Taipei 10617
| | - V Chekelian
- Max-Planck-Institut für Physik, 80805 München
| | - A Chen
- National Central University, Chung-li 32054
| | | | - K Chilikin
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | - K Cho
- Korea Institute of Science and Technology Information, Daejeon 305-806
| | - S-K Choi
- Gyeongsang National University, Chinju 660-701
| | - Y Choi
- Sungkyunkwan University, Suwon 440-746
| | - D Cinabro
- Wayne State University, Detroit, Michigan 48202
| | - S Cunliffe
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - N Dash
- Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
| | - S Di Carlo
- LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay
| | | | - Z Doležal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - T V Dong
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - Z Drásal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - S Eidelman
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - D Epifanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - J E Fast
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - T Ferber
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - B G Fulsom
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - R Garg
- Panjab University, Chandigarh 160014
| | - V Gaur
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - N Gabyshev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - A Garmash
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - M Gelb
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - A Giri
- Indian Institute of Technology Hyderabad, Telangana 502285
| | - P Goldenzweig
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - B Golob
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
| | - E Guido
- INFN - Sezione di Torino, 10125 Torino
| | - J Haba
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | | | | | - S Hirose
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - W-S Hou
- Department of Physics, National Taiwan University, Taipei 10617
| | - T Iijima
- Graduate School of Science, Nagoya University, Nagoya 464-8602
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
| | - K Inami
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - G Inguglia
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - A Ishikawa
- Department of Physics, Tohoku University, Sendai 980-8578
| | - R Itoh
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - M Iwasaki
- Osaka City University, Osaka 558-8585
| | - Y Iwasaki
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - W W Jacobs
- Indiana University, Bloomington, Indiana 47408
| | - I Jaegle
- University of Florida, Gainesville, Florida 32611
| | - H B Jeon
- Kyungpook National University, Daegu 702-701
| | - S Jia
- Beihang University, Beijing 100191
| | - Y Jin
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - D Joffe
- Kennesaw State University, Kennesaw, Georgia 30144
| | - K K Joo
- Chonnam National University, Kwangju 660-701
| | - T Julius
- School of Physics, University of Melbourne, Victoria 3010
| | - K H Kang
- Kyungpook National University, Daegu 702-701
| | | | - C Kiesling
- Max-Planck-Institut für Physik, 80805 München
| | - D Y Kim
- Soongsil University, Seoul 156-743
| | - H J Kim
- Kyungpook National University, Daegu 702-701
| | - J B Kim
- Korea University, Seoul 136-713
| | - K T Kim
- Korea University, Seoul 136-713
| | - S H Kim
- Hanyang University, Seoul 133-791
| | - K Kinoshita
- University of Cincinnati, Cincinnati, Ohio 45221
| | - P Kodyš
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - S Korpar
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | | | - P Križan
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
| | - R Kroeger
- University of Mississippi, University, Mississippi 38677
| | - P Krokovny
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - T Kuhr
- Ludwig Maximilians University, 80539 Munich
| | - R Kulasiri
- Kennesaw State University, Kennesaw, Georgia 30144
| | - A Kuzmin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - Y-J Kwon
- Yonsei University, Seoul 120-749
| | - J S Lange
- Justus-Liebig-Universität Gießen, 35392 Gießen
| | - I S Lee
- Hanyang University, Seoul 133-791
| | - S C Lee
- Kyungpook National University, Daegu 702-701
| | - L K Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - Y B Li
- Peking University, Beijing 100871
| | - L Li Gioi
- Max-Planck-Institut für Physik, 80805 München
| | - J Libby
- Indian Institute of Technology Madras, Chennai 600036
| | - D Liventsev
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - M Lubej
- J. Stefan Institute, 1000 Ljubljana
| | - T Luo
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - M Masuda
- Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
| | - T Matsuda
- University of Miyazaki, Miyazaki 889-2192
| | - D Matvienko
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - M Merola
- INFN - Sezione di Napoli, 80126 Napoli
- Università di Napoli Federico II, 80055 Napoli
| | - H Miyata
- Niigata University, Niigata 950-2181
| | - R Mizuk
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - G B Mohanty
- Tata Institute of Fundamental Research, Mumbai 400005
| | | | - T Mori
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - R Mussa
- INFN - Sezione di Torino, 10125 Torino
| | - M Nakao
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - T Nanut
- J. Stefan Institute, 1000 Ljubljana
| | - K J Nath
- Indian Institute of Technology Guwahati, Assam 781039
| | - Z Natkaniec
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
| | - M Nayak
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Wayne State University, Detroit, Michigan 48202
| | | | - N K Nisar
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - S Nishida
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - S Ogawa
- Toho University, Funabashi 274-8510
| | - S Okuno
- Kanagawa University, Yokohama 221-8686
| | - H Ono
- Nippon Dental University, Niigata 951-8580
- Niigata University, Niigata 950-2181
| | - P Pakhlov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
| | - G Pakhlova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - B Pal
- Brookhaven National Laboratory, Upton, New York 11973
| | - S Pardi
- INFN - Sezione di Napoli, 80126 Napoli
| | - H Park
- Kyungpook National University, Daegu 702-701
| | - S Paul
- Department of Physics, Technische Universität München, 85748 Garching
| | | | | | - L E Piilonen
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - V Popov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | | | - A Rabusov
- Department of Physics, Technische Universität München, 85748 Garching
| | - A Rostomyan
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - G Russo
- INFN - Sezione di Napoli, 80126 Napoli
| | - D Sahoo
- Tata Institute of Fundamental Research, Mumbai 400005
| | - Y Sakai
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - M Salehi
- Ludwig Maximilians University, 80539 Munich
- University of Malaya, 50603 Kuala Lumpur
| | - S Sandilya
- University of Cincinnati, Cincinnati, Ohio 45221
| | - L Santelj
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - T Sanuki
- Department of Physics, Tohoku University, Sendai 980-8578
| | - V Savinov
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - O Schneider
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
| | - G Schnell
- University of the Basque Country UPV/EHU, 48080 Bilbao
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao
| | - C Schwanda
- Institute of High Energy Physics, Vienna 1050
| | - R Seidl
- RIKEN BNL Research Center, Upton, New York 11973
| | - Y Seino
- Niigata University, Niigata 950-2181
| | - K Senyo
- Yamagata University, Yamagata 990-8560
| | - O Seon
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - M E Sevior
- School of Physics, University of Melbourne, Victoria 3010
| | - V Shebalin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - C P Shen
- Beihang University, Beijing 100191
| | - T-A Shibata
- Tokyo Institute of Technology, Tokyo 152-8550
| | - J-G Shiu
- Department of Physics, National Taiwan University, Taipei 10617
| | - F Simon
- Max-Planck-Institut für Physik, 80805 München
- Excellence Cluster Universe, Technische Universität München, 85748 Garching
| | - A Sokolov
- Institute for High Energy Physics, Protvino 142281
| | - E Solovieva
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - M Starič
- J. Stefan Institute, 1000 Ljubljana
| | - J F Strube
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | | | - T Sumiyoshi
- Tokyo Metropolitan University, Tokyo 192-0397
| | - W Sutcliffe
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - K Suzuki
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - M Takizawa
- J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198
- Showa Pharmaceutical University, Tokyo 194-8543
| | - U Tamponi
- INFN - Sezione di Torino, 10125 Torino
| | - K Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
| | - F Tenchini
- School of Physics, University of Melbourne, Victoria 3010
| | - M Uchida
- Tokyo Institute of Technology, Tokyo 152-8550
| | - T Uglov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - Y Unno
- Hanyang University, Seoul 133-791
| | - S Uno
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - P Urquijo
- School of Physics, University of Melbourne, Victoria 3010
| | - Y Usov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - S E Vahsen
- University of Hawaii, Honolulu, Hawaii 96822
| | - C Van Hulse
- University of the Basque Country UPV/EHU, 48080 Bilbao
| | - R Van Tonder
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - G Varner
- University of Hawaii, Honolulu, Hawaii 96822
| | - A Vinokurova
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - V Vorobyev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - E Waheed
- School of Physics, University of Melbourne, Victoria 3010
| | - B Wang
- University of Cincinnati, Cincinnati, Ohio 45221
| | - C H Wang
- National United University, Miao Li 36003
| | - M-Z Wang
- Department of Physics, National Taiwan University, Taipei 10617
| | - P Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - X L Wang
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - S Watanuki
- Department of Physics, Tohoku University, Sendai 980-8578
| | - E Widmann
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - E Won
- Korea University, Seoul 136-713
| | - H Ye
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - J Yelton
- University of Florida, Gainesville, Florida 32611
| | - J H Yin
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - C Z Yuan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - Y Yusa
- Niigata University, Niigata 950-2181
| | - Z P Zhang
- University of Science and Technology of China, Hefei 230026
| | - V Zhilich
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - V Zhukova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
| | - V Zhulanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - A Zupanc
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
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Ahn JK, Beckford B, Beechert J, Bryant K, Campbell M, Chen SH, Comfort J, Dona K, Hara N, Haraguchi H, Hsiung YB, Hutcheson M, Inagaki T, Kamiji I, Kawasaki N, Kim EJ, Kim JL, Kim YJ, Ko JW, Komatsubara TK, Kotera K, Kurilin AS, Lee JW, Lim GY, Lin C, Lin Q, Luo Y, Ma J, Maeda Y, Mari T, Masuda T, Matsumura T, Mcfarland D, McNeal N, Micallef J, Miyazaki K, Murayama R, Naito D, Nakagiri K, Nanjo H, Nishimiya H, Nomura T, Ohsugi M, Okuno H, Sasaki M, Sasao N, Sato K, Sato T, Sato Y, Schamis H, Seki S, Shimizu N, Shimogawa T, Shinkawa T, Shinohara S, Shiomi K, Su S, Sugiyama Y, Suzuki S, Tajima Y, Taylor M, Tecchio M, Togawa M, Tung YC, Wah YW, Watanabe H, Woo JK, Yamanaka T, Yoshida HY. Search for K_{L}→π^{0}νν[over ¯] and K_{L}→π^{0}X^{0} Decays at the J-PARC KOTO Experiment. Phys Rev Lett 2019; 122:021802. [PMID: 30720307 DOI: 10.1103/physrevlett.122.021802] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 12/14/2018] [Indexed: 06/09/2023]
Abstract
A search for the rare decay K_{L}→π^{0}νν[over ¯] was performed. With the data collected in 2015, corresponding to 2.2×10^{19} protons on target, a single event sensitivity of (1.30±0.01_{stat}±0.14_{syst})×10^{-9} was achieved and no candidate events were observed. We set an upper limit of 3.0×10^{-9} for the branching fraction of K_{L}→π^{0}νν[over ¯] at the 90% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for K_{L}→π^{0}X^{0} was also set as 2.4×10^{-9} at the 90% C.L., where X^{0} is an invisible boson with a mass of 135 MeV/c^{2}.
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Affiliation(s)
- J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - B Beckford
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - J Beechert
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - K Bryant
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Campbell
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - S H Chen
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - J Comfort
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - K Dona
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - N Hara
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Haraguchi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y B Hsiung
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - M Hutcheson
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - T Inagaki
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - I Kamiji
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - N Kawasaki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - E J Kim
- Division of Science Education, Chonbuk National University, Jeonju 54896, Republic of Korea
| | - J L Kim
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - Y J Kim
- Department of Physics, Jeju National University, Jeju 63243, Republic of Korea
| | - J W Ko
- Department of Physics, Jeju National University, Jeju 63243, Republic of Korea
| | - T K Komatsubara
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - K Kotera
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - A S Kurilin
- Laboratory of Nuclear Problems, Joint Institute for Nuclear Researches, Dubna, Moscow region 141980, Russia
| | - J W Lee
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - G Y Lim
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - C Lin
- Department of Physics, National Taiwan University, Taipei, Taiwan 10617, Republic of China
| | - Q Lin
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y Luo
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - J Ma
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y Maeda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Mari
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Masuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Matsumura
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - D Mcfarland
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
| | - N McNeal
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - J Micallef
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - K Miyazaki
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - R Murayama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - D Naito
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Nakagiri
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nanjo
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Nishimiya
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Nomura
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - M Ohsugi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Okuno
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - M Sasaki
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - N Sasao
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - K Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Sato
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Y Sato
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Schamis
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - S Seki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - N Shimizu
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Shimogawa
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - T Shinkawa
- Department of Applied Physics, National Defense Academy, Kanagawa 239-8686, Japan
| | - S Shinohara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - K Shiomi
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - S Su
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Y Sugiyama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Suzuki
- Department of Physics, Saga University, Saga 840-8502, Japan
| | - Y Tajima
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - M Taylor
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Tecchio
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - M Togawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y C Tung
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - Y W Wah
- Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - H Watanabe
- Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
- J-PARC Center, Tokai, Ibaraki 319-1195, Japan
| | - J K Woo
- Department of Physics, Jeju National University, Jeju 63243, Republic of Korea
| | - T Yamanaka
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Y Yoshida
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
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12
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Adachi I, Adye T, Ahmed H, Ahn JK, Aihara H, Akar S, Alam MS, Albert J, Anulli F, Arnaud N, Asner DM, Aston D, Atmacan H, Aushev T, Ayad R, Babu V, Badhrees I, Bakich AM, Banerjee S, Bansal V, Barlow RJ, Batignani G, Beaulieu A, Behera P, Bellis M, Ben-Haim E, Bernard D, Bernlochner FU, Bettarini S, Bettoni D, Bevan AJ, Bhardwaj V, Bhuyan B, Bianchi F, Biasini M, Biswal J, Blinov VE, Bomben M, Bondar A, Bonneaud GR, Bozek A, Bozzi C, Bračko M, Browder TE, Brown DN, Brown DN, Bünger C, Burchat PR, Buzykaev AR, Calabrese R, Calcaterra A, Calderini G, Di Carlo S, Carpinelli M, Cartaro C, Casarosa G, Cenci R, Chao DS, Chauveau J, Cheaib R, Chen A, Chen C, Cheng CH, Cheon BG, Chilikin K, Cho K, Choi Y, Choudhury S, Chrzaszcz M, Cibinetto G, Cinabro D, Cochran J, Coleman JP, Convery MR, Cowan G, Cowan R, Cremaldi L, Cunliffe S, Dash N, Davier M, Davis CL, De Mori F, De Nardo G, Denig AG, de Sangro R, Dey B, Di Lodovico F, Dittrich S, Doležal Z, Dorfan J, Drásal Z, Druzhinin VP, Dunwoodie W, Ebert M, Echenard B, Eidelman S, Eigen G, Eisner AM, Emery S, Epifanov D, Ernst JA, Faccini R, Fast JE, Feindt M, Ferber T, Ferrarotto F, Ferroni F, Field RC, Filippi A, Finocchiaro G, Fioravanti E, Flood KT, Forti F, Fritsch M, Fulsom BG, Gabathuler E, Gamba D, Garg R, Garmash A, Gary JW, Garzia I, Gaur V, Gaz A, Gelb M, Gershon TJ, Li Gioi L, Giorgi MA, Giri A, Godang R, Goldenzweig P, Golob B, Golubev VB, Gorodeisky R, Gradl W, Graham MT, Grauges E, Griessinger K, Gritsan AV, Grünberg O, Guan Y, Guido E, Guttman N, Haba J, Hafner A, Hara T, Harrison PF, Hast C, Hayasaka K, Hayashii H, Hearty C, Heck M, Hedges MT, Heß M, Hirose S, Hitlin DG, Honscheid K, Hou WS, Hsu CL, Huard Z, Van Hulse C, Hutchcroft DE, Inami K, Inguglia G, Innes WR, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Izen JM, Jacobs WW, Jawahery A, Jessop CP, Jia S, Jin Y, Joo KK, Julius T, Kaliyar AB, Kang KH, Karyan G, Kass R, Kichimi H, Kim DY, Kim JB, Kim KT, Kim SH, Kim J, Kim P, King GJ, Kinoshita K, Koch H, Kodyš P, Kolomensky YG, Korpar S, Kotchetkov D, Kowalewski R, Kravchenko EA, Križan P, Kroeger R, Krokovny P, Kuhr T, Kulasiri R, Kumita T, Kuzmin A, Kwon YJ, Lacker HM, Lafferty GD, Lanceri L, Lange JS, Lange DJ, Lankford AJ, Latham TE, Leddig T, Le Diberder F, Lee IS, Lee SC, Lees JP, Leith DWGS, Li LK, Li YB, Li Y, Libby J, Liventsev D, Lockman WS, Long O, LoSecco JM, Lou XC, Lubej M, Lueck T, Luitz S, Luo T, Luppi E, Lusiani A, Lutz AM, MacFarlane DB, MacNaughton J, Mallik U, Manoni E, Marchiori G, Margoni M, Martellotti S, Martinez-Vidal F, Masuda M, Matsuda T, Mattison TS, Matvienko D, McKenna JA, Meadows BT, Merola M, Miyabayashi K, Miyashita TS, Miyata H, Mizuk R, Mohanty GB, Moon HK, Mori T, Muller DR, Müller T, Mussa R, Nakano E, Nakao M, Nanut T, Nath KJ, Nayak M, Neal H, Neri N, Nisar NK, Nishida S, Nugent IM, Oberhof B, Ocariz J, Ogawa S, Ongmongkolkul P, Ono H, Onuchin AP, Onuki Y, Oyanguren A, Pakhlov P, Pakhlova G, Pal B, Palano A, Palombo F, Panduro Vazquez W, Paoloni E, Pardi S, Park H, Passaggio S, Patrignani C, Patteri P, Paul S, Pavelkin I, Payne DJ, Pedlar TK, Peimer DR, Peruzzi IM, Pestotnik R, Piccolo M, Piilonen LE, Pilloni A, Piredda G, Poireau V, Popov V, Porter FC, Posocco M, Prell S, Prepost R, Puccio EMT, Purohit MV, Pushpawela BG, Rama M, Randle-Conde A, Ratcliff BN, Raven G, Resmi PK, Ritchie JL, Ritter M, Rizzo G, Roberts DA, Robertson SH, Röhrken M, Roney JM, Roodman A, Rossi A, Rotondo M, Rozanska M, Russo G, Sacco R, Al Said S, Sakai Y, Salehi M, Sandilya S, Santelj L, Santoro V, Sanuki T, Savinov V, Schneider O, Schnell G, Schroeder T, Schubert KR, Schwanda C, Schwartz AJ, Schwitters RF, Sciacca C, Seddon RM, Seino Y, Sekula SJ, Senyo K, Seon O, Serednyakov SI, Sevior ME, Shebalin V, Shen CP, Shibata TA, Shimizu N, Shiu JG, Simi G, Simon F, Simonetto F, Skovpen YI, Smith JG, Smith AJS, So RY, Sobie RJ, Soffer A, Sokoloff MD, Solodov EP, Solovieva E, Spanier SM, Starič M, Stroili R, Sullivan MK, Sumisawa K, Sumiyoshi T, Summers DJ, Sun L, Takizawa M, Tamponi U, Tanida K, Taras P, Tasneem N, Tenchini F, Tisserand V, Todyshevx KY, Touramanis C, Uchida M, Uglov T, Unno Y, Uno S, Vahsen SE, Varner G, Vasseur G, Va'vra J, Červenkov D, Verderi M, Vitale L, Vorobyev V, Voß C, Wagner SR, Waheed E, Waldi R, Walsh JJ, Wang B, Wang CH, Wang MZ, Wang P, Watanabe Y, Wilson FF, Wilson JR, Wisniewski WJ, Won E, Wormser G, Wright DM, Wu SL, Ye H, Yuan CZ, Yusa Y, Zakharov S, Zallo A, Zani L, Zhang ZP, Zhilich V, Zhukova V, Zhulanov V, Zupanc A. First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity. Phys Rev Lett 2018; 121:261801. [PMID: 30636113 DOI: 10.1103/physrevlett.121.261801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 08/22/2018] [Indexed: 06/09/2023]
Abstract
We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B^{0}→D^{(*)}h^{0} with D→K_{S}^{0}π^{+}π^{-} decays, where h^{0}∈{π^{0},η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×10^{6}BB[over ¯] pairs recorded by the BABAR detector and (772±11)×10^{6}BB[over ¯] pairs recorded by the Belle detector. The results of the measurement are sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle β of the CKM Unitarity Triangle is β=[22.5±4.4(stat)±1.2(syst)±0.6(model)]°. The measurement assumes no direct CP violation in B^{0}→D^{(*)}h^{0} decays. The quoted model uncertainties are due to the composition of the D^{0}→K_{S}^{0}π^{+}π^{-} decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e^{+}e^{-}→cc[over ¯] data sample. CP violation is observed in B^{0}→D^{(*)}h^{0} decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2-β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.
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Affiliation(s)
- I Adachi
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Adye
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom
| | - H Ahmed
- St. Francis Xavier University, Antigonish, Nova Scotia, Canada B2G 2W5
| | - J K Ahn
- Korea University, Seoul 136-713, South Korea
| | - H Aihara
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - S Akar
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - M S Alam
- State University of New York, Albany, New York 12222, USA
| | - J Albert
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - F Anulli
- INFN Sezione di Roma, I-00185 Roma, Italy
| | - N Arnaud
- Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, F-91898 Orsay Cedex, France
| | - D M Asner
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - D Aston
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - H Atmacan
- University of South Carolina, Columbia, South Carolina 29208, USA
| | - T Aushev
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - R Ayad
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451, Kingdom of Saudi Arabia
| | - V Babu
- Tata Institute of Fundamental Research, Mumbai 400005, India
| | - I Badhrees
- King Abdulaziz City for Science and Technology, Riyadh 11442, Kingdom of Saudi Arabia
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451, Kingdom of Saudi Arabia
| | - A M Bakich
- School of Physics, University of Sydney, New South Wales 2006, Australia
| | - Sw Banerjee
- University of Louisville, Louisville, Kentucky 40292, USA
| | - V Bansal
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - R J Barlow
- University of Manchester, Manchester M13 9PL, United Kingdom
| | - G Batignani
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - A Beaulieu
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - P Behera
- Indian Institute of Technology Madras, Chennai 600036, India
| | - M Bellis
- Stanford University, Stanford, California 94305, USA
| | - E Ben-Haim
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - D Bernard
- Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France
| | - F U Bernlochner
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - S Bettarini
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - D Bettoni
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
| | - A J Bevan
- Queen Mary, University of London, London, E1 4NS, United Kingdom
| | - V Bhardwaj
- Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306, India
| | - B Bhuyan
- Indian Institute of Technology Guwahati, Assam 781039, India
| | - F Bianchi
- INFN Sezione di Torino, I-10125 Torino, Italy
- Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy
| | - M Biasini
- INFN Sezione di Perugia, I-06123 Perugia, Italy
- Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy
| | - J Biswal
- J. Stefan Institute, 1000 Ljubljana, Slovenia
| | - V E Blinov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
- Novosibirsk State Technical University, Novosibirsk 630092, Russian Federation
| | - M Bomben
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - A Bondar
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - G R Bonneaud
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - A Bozek
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342, Poland
| | - C Bozzi
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
| | - M Bračko
- J. Stefan Institute, 1000 Ljubljana, Slovenia
- University of Maribor, 2000 Maribor, Slovenia
| | - T E Browder
- University of Hawaii, Honolulu, Hawaii 96822, USA
| | - D N Brown
- Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA
| | - D N Brown
- University of Louisville, Louisville, Kentucky 40292, USA
| | - C Bünger
- Universität Rostock, D-18051 Rostock, Germany
| | - P R Burchat
- Stanford University, Stanford, California 94305, USA
| | - A R Buzykaev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
| | - R Calabrese
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy
| | - A Calcaterra
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - G Calderini
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - S Di Carlo
- Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, F-91898 Orsay Cedex, France
| | - M Carpinelli
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - C Cartaro
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - G Casarosa
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - R Cenci
- University of Maryland, College Park, Maryland 20742, USA
| | - D S Chao
- California Institute of Technology, Pasadena, California 91125, USA
| | - J Chauveau
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - R Cheaib
- University of Mississippi, University, Mississippi 38677, USA
| | - A Chen
- National Central University, Chung-li 32054, Taiwan
| | - C Chen
- Iowa State University, Ames, Iowa 50011, USA
| | - C H Cheng
- California Institute of Technology, Pasadena, California 91125, USA
| | - B G Cheon
- Hanyang University, Seoul 133-791, South Korea
| | - K Chilikin
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
| | - K Cho
- Korea Institute of Science and Technology Information, Daejeon 305-806, South Korea
| | - Y Choi
- Sungkyunkwan University, Suwon 440-746, South Korea
| | - S Choudhury
- Indian Institute of Technology Hyderabad, Telangana 502285, India
| | | | - G Cibinetto
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy
| | - D Cinabro
- Wayne State University, Detroit, Michigan 48202, USA
| | - J Cochran
- Iowa State University, Ames, Iowa 50011, USA
| | - J P Coleman
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - M R Convery
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - G Cowan
- University of London, Royal Holloway and Bedford New College, Egham, Surrey TW20 0EX, United Kingdom
| | - R Cowan
- Massachusetts Institute of Technology, Laboratory for Nuclear Science, Cambridge, Massachusetts 02139, USA
| | - L Cremaldi
- University of Mississippi, University, Mississippi 38677, USA
| | - S Cunliffe
- Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | - N Dash
- Indian Institute of Technology Bhubaneswar, Satya Nagar 751007, India
| | - M Davier
- Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, F-91898 Orsay Cedex, France
| | - C L Davis
- University of Louisville, Louisville, Kentucky 40292, USA
| | - F De Mori
- INFN Sezione di Torino, I-10125 Torino, Italy
- Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy
| | - G De Nardo
- INFN Sezione di Napoli, I-80126 Napoli, Italy
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy
| | - A G Denig
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany
| | - R de Sangro
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - B Dey
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - F Di Lodovico
- Queen Mary, University of London, London, E1 4NS, United Kingdom
| | - S Dittrich
- Universität Rostock, D-18051 Rostock, Germany
| | - Z Doležal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic
| | - J Dorfan
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - Z Drásal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic
| | - V P Druzhinin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - W Dunwoodie
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - M Ebert
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - B Echenard
- California Institute of Technology, Pasadena, California 91125, USA
| | - S Eidelman
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - G Eigen
- University of Bergen, Institute of Physics, N-5007 Bergen, Norway
| | - A M Eisner
- University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA
| | - S Emery
- CEA, Irfu, SPP, Centre de Saclay, F-91191 Gif-sur-Yvette, France
| | - D Epifanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - J A Ernst
- State University of New York, Albany, New York 12222, USA
| | - R Faccini
- INFN Sezione di Roma, I-00185 Roma, Italy
- Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy
| | - J E Fast
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - M Feindt
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
| | - T Ferber
- Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | | | - F Ferroni
- INFN Sezione di Roma, I-00185 Roma, Italy
- Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy
| | - R C Field
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - A Filippi
- INFN Sezione di Torino, I-10125 Torino, Italy
| | - G Finocchiaro
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - E Fioravanti
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy
| | - K T Flood
- California Institute of Technology, Pasadena, California 91125, USA
| | - F Forti
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - M Fritsch
- Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany
| | - B G Fulsom
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - E Gabathuler
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - D Gamba
- INFN Sezione di Torino, I-10125 Torino, Italy
- Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy
| | - R Garg
- Panjab University, Chandigarh 160014, India
| | - A Garmash
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - J W Gary
- University of California at Riverside, Riverside, California 92521, USA
| | - I Garzia
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy
| | - V Gaur
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - A Gaz
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - M Gelb
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
| | - T J Gershon
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - L Li Gioi
- Max-Planck-Institut für Physik, 80805 München, Germany
| | - M A Giorgi
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - A Giri
- Indian Institute of Technology Hyderabad, Telangana 502285, India
| | - R Godang
- University of Mississippi, University, Mississippi 38677, USA
| | - P Goldenzweig
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
| | - B Golob
- J. Stefan Institute, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - V B Golubev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - R Gorodeisky
- Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel
| | - W Gradl
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany
| | - M T Graham
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - E Grauges
- Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain
| | - K Griessinger
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany
| | - A V Gritsan
- Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - O Grünberg
- Universität Rostock, D-18051 Rostock, Germany
| | - Y Guan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
- Indiana University, Bloomington, Indiana 47408, USA
| | - E Guido
- INFN Sezione di Torino, I-10125 Torino, Italy
| | - N Guttman
- Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel
| | - J Haba
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - A Hafner
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany
| | - T Hara
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - P F Harrison
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - C Hast
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - K Hayasaka
- Niigata University, Niigata 950-2181, Japan
| | - H Hayashii
- Nara Women's University, Nara 630-8506, Japan
| | - C Hearty
- Institute of Particle Physics, Vancouver, British Columbia, Canada V6T 1Z1
- University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - M Heck
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
| | - M T Hedges
- University of Hawaii, Honolulu, Hawaii 96822, USA
| | - M Heß
- Universität Rostock, D-18051 Rostock, Germany
| | - S Hirose
- Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - D G Hitlin
- California Institute of Technology, Pasadena, California 91125, USA
| | - K Honscheid
- Ohio State University, Columbus, Ohio 43210, USA
| | - W-S Hou
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - C-L Hsu
- School of Physics, University of Melbourne, Victoria 3010, Australia
| | - Z Huard
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - C Van Hulse
- University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
| | - D E Hutchcroft
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - K Inami
- Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - G Inguglia
- Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | - W R Innes
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - A Ishikawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - R Itoh
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - M Iwasaki
- Osaka City University, Osaka 558-8585, Japan
| | - Y Iwasaki
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - J M Izen
- University of Texas at Dallas, Richardson, Texas 75083, USA
| | - W W Jacobs
- Indiana University, Bloomington, Indiana 47408, USA
| | - A Jawahery
- University of Maryland, College Park, Maryland 20742, USA
| | - C P Jessop
- University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - S Jia
- Beihang University, Beijing 100191, China
| | - Y Jin
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - K K Joo
- Chonnam National University, Kwangju 660-701, South Korea
| | - T Julius
- School of Physics, University of Melbourne, Victoria 3010, Australia
| | - A B Kaliyar
- Indian Institute of Technology Madras, Chennai 600036, India
| | - K H Kang
- Kyungpook National University, Daegu 702-701, South Korea
| | - G Karyan
- Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | - R Kass
- Ohio State University, Columbus, Ohio 43210, USA
| | - H Kichimi
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - D Y Kim
- Soongsil University, Seoul 156-743, South Korea
| | - J B Kim
- Korea University, Seoul 136-713, South Korea
| | - K T Kim
- Korea University, Seoul 136-713, South Korea
| | - S H Kim
- Hanyang University, Seoul 133-791, South Korea
| | - J Kim
- California Institute of Technology, Pasadena, California 91125, USA
| | - P Kim
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - G J King
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - K Kinoshita
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - H Koch
- Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany
| | - P Kodyš
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic
| | - Yu G Kolomensky
- Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA
| | - S Korpar
- J. Stefan Institute, 1000 Ljubljana, Slovenia
- University of Maribor, 2000 Maribor, Slovenia
| | - D Kotchetkov
- University of Hawaii, Honolulu, Hawaii 96822, USA
| | - R Kowalewski
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - E A Kravchenko
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - P Križan
- J. Stefan Institute, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
| | - R Kroeger
- University of Mississippi, University, Mississippi 38677, USA
| | - P Krokovny
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - T Kuhr
- Ludwig Maximilians University, 80539 Munich, Germany
| | - R Kulasiri
- Kennesaw State University, Kennesaw, Georgia 30144, USA
| | - T Kumita
- Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - A Kuzmin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - Y-J Kwon
- Yonsei University, Seoul 120-749, South Korea
| | - H M Lacker
- Humboldt-Universität zu Berlin, Institut für Physik, D-12489 Berlin, Germany
| | - G D Lafferty
- University of Manchester, Manchester M13 9PL, United Kingdom
| | - L Lanceri
- INFN Sezione di Trieste and Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy
| | - J S Lange
- Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
| | - D J Lange
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Lankford
- University of California at Irvine, Irvine, California 92697, USA
| | - T E Latham
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - T Leddig
- Universität Rostock, D-18051 Rostock, Germany
| | - F Le Diberder
- Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, F-91898 Orsay Cedex, France
| | - I S Lee
- Hanyang University, Seoul 133-791, South Korea
| | - S C Lee
- Kyungpook National University, Daegu 702-701, South Korea
| | - J P Lees
- Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France
| | - D W G S Leith
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - L K Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Y B Li
- Peking University, Beijing 100871, China
| | - Y Li
- California Institute of Technology, Pasadena, California 91125, USA
| | - J Libby
- Indian Institute of Technology Madras, Chennai 600036, India
| | - D Liventsev
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - W S Lockman
- University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA
| | - O Long
- University of California at Riverside, Riverside, California 92521, USA
| | - J M LoSecco
- University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - X C Lou
- University of Texas at Dallas, Richardson, Texas 75083, USA
| | - M Lubej
- J. Stefan Institute, 1000 Ljubljana, Slovenia
| | - T Lueck
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - S Luitz
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - T Luo
- Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443, China
| | - E Luppi
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy
| | - A Lusiani
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Scuola Normale Superiore di Pisa, I-56127 Pisa, Italy
| | - A M Lutz
- Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, F-91898 Orsay Cedex, France
| | - D B MacFarlane
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - J MacNaughton
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - U Mallik
- University of Iowa, Iowa City, Iowa 52242, USA
| | - E Manoni
- INFN Sezione di Perugia, I-06123 Perugia, Italy
| | - G Marchiori
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - M Margoni
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy
| | - S Martellotti
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | | | - M Masuda
- Earthquake Research Institute, University of Tokyo, Tokyo 113-0032, Japan
| | - T Matsuda
- University of Miyazaki, Miyazaki 889-2192, Japan
| | - T S Mattison
- University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - D Matvienko
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - J A McKenna
- University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - B T Meadows
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - M Merola
- INFN Sezione di Napoli, I-80126 Napoli, Italy
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy
| | | | - T S Miyashita
- California Institute of Technology, Pasadena, California 91125, USA
| | - H Miyata
- Niigata University, Niigata 950-2181, Japan
| | - R Mizuk
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Physical Engineering Institute, Moscow 115409, Russian Federation
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - G B Mohanty
- Tata Institute of Fundamental Research, Mumbai 400005, India
| | - H K Moon
- Korea University, Seoul 136-713, South Korea
| | - T Mori
- Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - D R Muller
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - T Müller
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
| | - R Mussa
- INFN Sezione di Torino, I-10125 Torino, Italy
| | - E Nakano
- Osaka City University, Osaka 558-8585, Japan
| | - M Nakao
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Nanut
- J. Stefan Institute, 1000 Ljubljana, Slovenia
| | - K J Nath
- Indian Institute of Technology Guwahati, Assam 781039, India
| | - M Nayak
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
- Wayne State University, Detroit, Michigan 48202, USA
| | - H Neal
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - N Neri
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - N K Nisar
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
| | - S Nishida
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - I M Nugent
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - B Oberhof
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - J Ocariz
- Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France
| | - S Ogawa
- Toho University, Funabashi 274-8510, Japan
| | - P Ongmongkolkul
- California Institute of Technology, Pasadena, California 91125, USA
| | - H Ono
- Nippon Dental University, Niigata 951-8580, Japan
- Niigata University, Niigata 950-2181, Japan
| | - A P Onuchin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
- Novosibirsk State Technical University, Novosibirsk 630092, Russian Federation
| | - Y Onuki
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - A Oyanguren
- IFIC, Universitat de Valencia-CSIC, E-46071 Valencia, Spain
| | - P Pakhlov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Physical Engineering Institute, Moscow 115409, Russian Federation
| | - G Pakhlova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - B Pal
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - A Palano
- INFN Sezione di Bari and Dipartimento di Fisica, Università di Bari, I-70126 Bari, Italy
| | - F Palombo
- INFN Sezione di Milano, I-20133 Milano, Italy
- Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy
| | - W Panduro Vazquez
- University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA
| | - E Paoloni
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - S Pardi
- INFN Sezione di Napoli, I-80126 Napoli, Italy
| | - H Park
- Kyungpook National University, Daegu 702-701, South Korea
| | - S Passaggio
- INFN Sezione di Genova, I-16146 Genova, Italy
| | | | - P Patteri
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - S Paul
- Department of Physics, Technische Universität München, 85748 Garching, Germany
| | - I Pavelkin
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - D J Payne
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - T K Pedlar
- Luther College, Decorah, Iowa 52101, USA
| | - D R Peimer
- Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel
| | - I M Peruzzi
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - R Pestotnik
- J. Stefan Institute, 1000 Ljubljana, Slovenia
| | - M Piccolo
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - L E Piilonen
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - A Pilloni
- INFN Sezione di Roma, I-00185 Roma, Italy
- Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy
| | - G Piredda
- INFN Sezione di Roma, I-00185 Roma, Italy
| | - V Poireau
- Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France
| | - V Popov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - F C Porter
- California Institute of Technology, Pasadena, California 91125, USA
| | - M Posocco
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - S Prell
- Iowa State University, Ames, Iowa 50011, USA
| | - R Prepost
- University of Wisconsin, Madison, Wisconsin 53706, USA
| | - E M T Puccio
- Stanford University, Stanford, California 94305, USA
| | - M V Purohit
- University of South Carolina, Columbia, South Carolina 29208, USA
| | | | - M Rama
- INFN Sezione di Pisa, I-56127 Pisa, Italy
| | | | - B N Ratcliff
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - G Raven
- NIKHEF, National Institute for Nuclear Physics and High Energy Physics, NL-1009 DB Amsterdam, The Netherlands
| | - P K Resmi
- Indian Institute of Technology Madras, Chennai 600036, India
| | - J L Ritchie
- University of Texas at Austin, Austin, Texas 78712, USA
| | - M Ritter
- Ludwig Maximilians University, 80539 Munich, Germany
| | - G Rizzo
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - D A Roberts
- University of Maryland, College Park, Maryland 20742, USA
| | - S H Robertson
- Institute of Particle Physics, Montréal, Québec, Canada H3A 2T8
- McGill University, Montréal, Québec, Canada H3A 2T8
| | - M Röhrken
- California Institute of Technology, Pasadena, California 91125, USA
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
| | - J M Roney
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - A Roodman
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - A Rossi
- INFN Sezione di Perugia, I-06123 Perugia, Italy
| | - M Rotondo
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - M Rozanska
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342, Poland
| | - G Russo
- INFN Sezione di Napoli, I-80126 Napoli, Italy
| | - R Sacco
- Queen Mary, University of London, London, E1 4NS, United Kingdom
| | - S Al Said
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi Arabia
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451, Kingdom of Saudi Arabia
| | - Y Sakai
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - M Salehi
- Ludwig Maximilians University, 80539 Munich, Germany
- University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - S Sandilya
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - L Santelj
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - V Santoro
- INFN Sezione di Ferrara, I-44122 Ferrara, Italy
| | - T Sanuki
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - V Savinov
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
| | - O Schneider
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - G Schnell
- University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
| | - T Schroeder
- Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany
| | - K R Schubert
- Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany
| | - C Schwanda
- Institute of High Energy Physics, Vienna 1050, Austria
| | - A J Schwartz
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | | | - C Sciacca
- INFN Sezione di Napoli, I-80126 Napoli, Italy
- Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy
| | - R M Seddon
- McGill University, Montréal, Québec, Canada H3A 2T8
| | - Y Seino
- Niigata University, Niigata 950-2181, Japan
| | - S J Sekula
- Southern Methodist University, Dallas, Texas 75275, USA
| | - K Senyo
- Yamagata University, Yamagata 990-8560, Japan
| | - O Seon
- Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - S I Serednyakov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - M E Sevior
- School of Physics, University of Melbourne, Victoria 3010, Australia
| | - V Shebalin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - C P Shen
- Beihang University, Beijing 100191, China
| | - T-A Shibata
- Tokyo Institute of Technology, Tokyo 152-8550, Japan
| | - N Shimizu
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - J-G Shiu
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - G Simi
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy
| | - F Simon
- Max-Planck-Institut für Physik, 80805 München, Germany
- Excellence Cluster Universe, Technische Universität München, 85748 Garching, Germany
| | - F Simonetto
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy
| | - Yu I Skovpen
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - J G Smith
- University of Colorado, Boulder, Colorado 80309, USA
| | - A J S Smith
- Princeton University, Princeton, New Jersey 08544, USA
| | - R Y So
- University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
| | - R J Sobie
- Institute of Particle Physics, Victoria, British Columbia, Canada V8W 3P6
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - A Soffer
- Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel
| | - M D Sokoloff
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - E P Solodov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - E Solovieva
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - S M Spanier
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Starič
- J. Stefan Institute, 1000 Ljubljana, Slovenia
| | - R Stroili
- INFN Sezione di Padova, I-35131 Padova, Italy
- Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy
| | - M K Sullivan
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - K Sumisawa
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Sumiyoshi
- Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - D J Summers
- University of Mississippi, University, Mississippi 38677, USA
| | - L Sun
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - M Takizawa
- J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
- Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198, Japan
- Showa Pharmaceutical University, Tokyo 194-8543, Japan
| | - U Tamponi
- INFN Sezione di Torino, I-10125 Torino, Italy
| | - K Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195, Japan
| | - P Taras
- Université de Montréal, Physique des Particules, Montréal, Québec, Canada H3C 3J7
| | - N Tasneem
- University of Victoria, Victoria, British Columbia, Canada V8W 3P6
| | - F Tenchini
- School of Physics, University of Melbourne, Victoria 3010, Australia
| | - V Tisserand
- Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France
| | - K Yu Todyshevx
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - C Touramanis
- University of Liverpool, Liverpool L69 7ZE, United Kingdom
| | - M Uchida
- Tokyo Institute of Technology, Tokyo 152-8550, Japan
| | - T Uglov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - Y Unno
- Hanyang University, Seoul 133-791, South Korea
| | - S Uno
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - S E Vahsen
- University of Hawaii, Honolulu, Hawaii 96822, USA
| | - G Varner
- University of Hawaii, Honolulu, Hawaii 96822, USA
| | - G Vasseur
- CEA, Irfu, SPP, Centre de Saclay, F-91191 Gif-sur-Yvette, France
| | - J Va'vra
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - D Červenkov
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic
| | - M Verderi
- Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France
| | - L Vitale
- INFN Sezione di Trieste and Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy
| | - V Vorobyev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - C Voß
- Universität Rostock, D-18051 Rostock, Germany
| | - S R Wagner
- University of Colorado, Boulder, Colorado 80309, USA
| | - E Waheed
- School of Physics, University of Melbourne, Victoria 3010, Australia
| | - R Waldi
- Universität Rostock, D-18051 Rostock, Germany
| | - J J Walsh
- INFN Sezione di Pisa, I-56127 Pisa, Italy
| | - B Wang
- University of Cincinnati, Cincinnati, Ohio 45221, USA
| | - C H Wang
- National United University, Miao Li 36003, Taiwan
| | - M-Z Wang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - P Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Y Watanabe
- Kanagawa University, Yokohama 221-8686, Japan
| | - F F Wilson
- Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom
| | - J R Wilson
- University of South Carolina, Columbia, South Carolina 29208, USA
| | - W J Wisniewski
- SLAC National Accelerator Laboratory, Stanford, California 94309 USA
| | - E Won
- Korea University, Seoul 136-713, South Korea
| | - G Wormser
- Laboratoire de l'Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d'Orsay, F-91898 Orsay Cedex, France
| | - D M Wright
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S L Wu
- University of Wisconsin, Madison, Wisconsin 53706, USA
| | - H Ye
- Deutsches Elektronen-Synchrotron, 22607 Hamburg, Germany
| | - C Z Yuan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Y Yusa
- Niigata University, Niigata 950-2181, Japan
| | - S Zakharov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Institute of Physics and Technology, Moscow Region 141700, Russian Federation
| | - A Zallo
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
| | - L Zani
- INFN Sezione di Pisa, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy
| | - Z P Zhang
- University of Science and Technology of China, Hefei 230026, China
| | - V Zhilich
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - V Zhukova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation
- Moscow Physical Engineering Institute, Moscow 115409, Russian Federation
| | - V Zhulanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation
- Novosibirsk State University, Novosibirsk 630090, Russian Federation
| | - A Zupanc
- J. Stefan Institute, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
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Yelton J, Adachi I, Ahn JK, Aihara H, Al Said S, Asner DM, Atmacan H, Aushev T, Ayad R, Babu V, Badhrees I, Bahinipati S, Bakich AM, Bansal V, Beleño C, Berger M, Bhardwaj V, Bhuyan B, Bilka T, Biswal J, Bondar A, Bonvicini G, Bozek A, Bračko M, Browder TE, Červenkov D, Chekelian V, Chen A, Cheon BG, Chilikin K, Cho K, Choi SK, Choi Y, Choudhury S, Cinabro D, Cunliffe S, Czank T, Dash N, Di Carlo S, Doležal Z, Dong TV, Drásal Z, Eidelman S, Epifanov D, Fast JE, Fulsom BG, Garg R, Gaur V, Gabyshev N, Garmash A, Gelb M, Giri A, Goldenzweig P, Greenwald D, Guido E, Haba J, Hayasaka K, Hayashii H, Hirose S, Hou WS, Inami K, Inguglia G, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Jacobs WW, Jeon HB, Jia S, Jin Y, Joo KK, Julius T, Kaliyar AB, Kang KH, Karyan G, Kato Y, Kiesling C, Kim DY, Kim JB, Kim KT, Kim SH, Kinoshita K, Kodyš P, Korpar S, Kotchetkov D, Križan P, Kroeger R, Krokovny P, Kuhr T, Kumar R, Kuzmin A, Kwon YJ, Lange JS, Lee IS, Lee SC, Li LK, Li YB, Li Gioi L, Libby J, Liventsev D, Lubej M, Luo T, Masuda M, Matsuda T, Matvienko D, McNeil JT, Merola M, Miyabayashi K, Miyata H, Mizuk R, Mohanty GB, Moon HK, Mori T, Mussa R, Nakano E, Nakao M, Nanut T, Nath KJ, Natkaniec Z, Niiyama M, Nisar NK, Nishida S, Ono H, Pakhlov P, Pakhlova G, Pal B, Pardi S, Park H, Paul S, Pedlar TK, Pestotnik R, Piilonen LE, Popov V, Ritter M, Russo G, Sahoo D, Sakai Y, Sandilya S, Santelj L, Sanuki T, Savinov V, Schneider O, Schnell G, Schwanda C, Seino Y, Senyo K, Sevior ME, Shebalin V, Shen CP, Shibata TA, Shiu JG, Shwartz B, Simon F, Sokolov A, Solovieva E, Starič M, Strube JF, Sumihama M, Sumiyoshi T, Suzuki K, Takizawa M, Tamponi U, Tanida K, Tao Y, Tenchini F, Uchida M, Uglov T, Uno S, Urquijo P, Usov Y, Vahsen SE, Van Hulse C, Varner G, Vorobyev V, Vossen A, Wang B, Wang CH, Wang MZ, Wang P, Wang XL, Watanabe M, Watanuki S, Widmann E, Won E, Ye H, Yuan CZ, Yusa Y, Zakharov S, Zhang ZP, Zhilich V, Zhukova V, Zhulanov V. Observation of an Excited Ω^{-} Baryon. Phys Rev Lett 2018; 121:052003. [PMID: 30118260 DOI: 10.1103/physrevlett.121.052003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 06/08/2023]
Abstract
Using data recorded with the Belle detector, we observe a new excited hyperon, an Ω^{*-} candidate decaying into Ξ^{0}K^{-} and Ξ^{-}K_{S}^{0} with a mass of 2012.4±0.7(stat)±0.6(syst) MeV/c^{2} and a width of Γ=6.4_{-2.0}^{+2.5}(stat)±1.6(syst) MeV. The Ω^{*-} is seen primarily in ϒ(1S),ϒ(2S), and ϒ(3S) decays.
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Affiliation(s)
- J Yelton
- University of Florida, Gainesville, Florida 32611
| | - I Adachi
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - J K Ahn
- Korea University, Seoul 136-713
| | - H Aihara
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - S Al Said
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - D M Asner
- Brookhaven National Laboratory, Upton, New York 11973
| | - H Atmacan
- University of South Carolina, Columbia, South Carolina 29208
| | - T Aushev
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - R Ayad
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - V Babu
- Tata Institute of Fundamental Research, Mumbai 400005
| | - I Badhrees
- King Abdulaziz City for Science and Technology, Riyadh 11442
- Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
| | - S Bahinipati
- Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
| | - A M Bakich
- School of Physics, University of Sydney, New South Wales 2006
| | - V Bansal
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - C Beleño
- II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen
| | - M Berger
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - V Bhardwaj
- Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
| | - B Bhuyan
- Indian Institute of Technology Guwahati, Assam 781039
| | - T Bilka
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - J Biswal
- J. Stefan Institute, 1000 Ljubljana
| | - A Bondar
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - G Bonvicini
- Wayne State University, Detroit, Michigan 48202
| | - A Bozek
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
| | - M Bračko
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | - T E Browder
- University of Hawaii, Honolulu, Hawaii 96822
| | - D Červenkov
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - V Chekelian
- Max-Planck-Institut für Physik, 80805 München
| | - A Chen
- National Central University, Chung-li 32054
| | | | - K Chilikin
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
| | - K Cho
- Korea Institute of Science and Technology Information, Daejeon 305-806
| | - S-K Choi
- Gyeongsang National University, Chinju 660-701
| | - Y Choi
- Sungkyunkwan University, Suwon 440-746
| | - S Choudhury
- Indian Institute of Technology Hyderabad, Telangana 502285
| | - D Cinabro
- Wayne State University, Detroit, Michigan 48202
| | - S Cunliffe
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - T Czank
- Department of Physics, Tohoku University, Sendai 980-8578
| | - N Dash
- Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
| | - S Di Carlo
- LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay
| | - Z Doležal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - T V Dong
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - Z Drásal
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - S Eidelman
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - D Epifanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - J E Fast
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - B G Fulsom
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | - R Garg
- Panjab University, Chandigarh 160014
| | - V Gaur
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - N Gabyshev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - A Garmash
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - M Gelb
- Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - A Giri
- Indian Institute of Technology Hyderabad, Telangana 502285
| | - P Goldenzweig
- Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
| | - D Greenwald
- Department of Physics, Technische Universität München, 85748 Garching
| | - E Guido
- INFN-Sezione di Torino, 10125 Torino
| | - J Haba
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | | | | | - S Hirose
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - W-S Hou
- Department of Physics, National Taiwan University, Taipei 10617
| | - K Inami
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - G Inguglia
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - A Ishikawa
- Department of Physics, Tohoku University, Sendai 980-8578
| | - R Itoh
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - M Iwasaki
- Osaka City University, Osaka 558-8585
| | - Y Iwasaki
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - W W Jacobs
- Indiana University, Bloomington, Indiana 47408
| | - H B Jeon
- Kyungpook National University, Daegu 702-701
| | - S Jia
- Beihang University, Beijing 100191
| | - Y Jin
- Department of Physics, University of Tokyo, Tokyo 113-0033
| | - K K Joo
- Chonnam National University, Kwangju 660-701
| | - T Julius
- School of Physics, University of Melbourne, Victoria 3010
| | - A B Kaliyar
- Indian Institute of Technology Madras, Chennai 600036
| | - K H Kang
- Kyungpook National University, Daegu 702-701
| | - G Karyan
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - Y Kato
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - C Kiesling
- Max-Planck-Institut für Physik, 80805 München
| | - D Y Kim
- Soongsil University, Seoul 156-743
| | - J B Kim
- Korea University, Seoul 136-713
| | - K T Kim
- Korea University, Seoul 136-713
| | - S H Kim
- Hanyang University, Seoul 133-791
| | - K Kinoshita
- University of Cincinnati, Cincinnati, Ohio 45221
| | - P Kodyš
- Faculty of Mathematics and Physics, Charles University, 121 16 Prague
| | - S Korpar
- J. Stefan Institute, 1000 Ljubljana
- University of Maribor, 2000 Maribor
| | | | - P Križan
- J. Stefan Institute, 1000 Ljubljana
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
| | - R Kroeger
- University of Mississippi, University, Mississippi 38677
| | - P Krokovny
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - T Kuhr
- Ludwig Maximilians University, 80539 Munich
| | - R Kumar
- Punjab Agricultural University, Ludhiana 141004
| | - A Kuzmin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - Y-J Kwon
- Yonsei University, Seoul 120-749
| | - J S Lange
- Justus-Liebig-Universität Gießen, 35392 Gießen
| | - I S Lee
- Hanyang University, Seoul 133-791
| | - S C Lee
- Kyungpook National University, Daegu 702-701
| | - L K Li
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - Y B Li
- Peking University, Beijing 100871
| | - L Li Gioi
- Max-Planck-Institut für Physik, 80805 München
| | - J Libby
- Indian Institute of Technology Madras, Chennai 600036
| | - D Liventsev
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - M Lubej
- J. Stefan Institute, 1000 Ljubljana
| | - T Luo
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | - M Masuda
- Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
| | - T Matsuda
- University of Miyazaki, Miyazaki 889-2192
| | - D Matvienko
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - J T McNeil
- University of Florida, Gainesville, Florida 32611
| | - M Merola
- INFN-Sezione di Napoli, 80126 Napoli
- Università di Napoli Federico II, 80055 Napoli
| | | | - H Miyata
- Niigata University, Niigata 950-2181
| | - R Mizuk
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - G B Mohanty
- Tata Institute of Fundamental Research, Mumbai 400005
| | | | - T Mori
- Graduate School of Science, Nagoya University, Nagoya 464-8602
| | - R Mussa
- INFN-Sezione di Torino, 10125 Torino
| | - E Nakano
- Osaka City University, Osaka 558-8585
| | - M Nakao
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - T Nanut
- J. Stefan Institute, 1000 Ljubljana
| | - K J Nath
- Indian Institute of Technology Guwahati, Assam 781039
| | - Z Natkaniec
- H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
| | | | - N K Nisar
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - S Nishida
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - H Ono
- Nippon Dental University, Niigata 951-8580
- Niigata University, Niigata 950-2181
| | - P Pakhlov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
| | - G Pakhlova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - B Pal
- Brookhaven National Laboratory, Upton, New York 11973
| | - S Pardi
- INFN-Sezione di Napoli, 80126 Napoli
| | - H Park
- Kyungpook National University, Daegu 702-701
| | - S Paul
- Department of Physics, Technische Universität München, 85748 Garching
| | | | | | - L E Piilonen
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
| | - V Popov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - M Ritter
- Ludwig Maximilians University, 80539 Munich
| | - G Russo
- INFN-Sezione di Napoli, 80126 Napoli
| | - D Sahoo
- Tata Institute of Fundamental Research, Mumbai 400005
| | - Y Sakai
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - S Sandilya
- University of Cincinnati, Cincinnati, Ohio 45221
| | - L Santelj
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - T Sanuki
- Department of Physics, Tohoku University, Sendai 980-8578
| | - V Savinov
- University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - O Schneider
- École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
| | - G Schnell
- University of the Basque Country UPV/EHU, 48080 Bilbao
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao
| | - C Schwanda
- Institute of High Energy Physics, Vienna 1050
| | - Y Seino
- Niigata University, Niigata 950-2181
| | - K Senyo
- Yamagata University, Yamagata 990-8560
| | - M E Sevior
- School of Physics, University of Melbourne, Victoria 3010
| | - V Shebalin
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - C P Shen
- Beihang University, Beijing 100191
| | - T-A Shibata
- Tokyo Institute of Technology, Tokyo 152-8550
| | - J-G Shiu
- Department of Physics, National Taiwan University, Taipei 10617
| | - B Shwartz
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - F Simon
- Max-Planck-Institut für Physik, 80805 München
- Excellence Cluster Universe, Technische Universität München, 85748 Garching
| | - A Sokolov
- Institute for High Energy Physics, Protvino 142281
| | - E Solovieva
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - M Starič
- J. Stefan Institute, 1000 Ljubljana
| | - J F Strube
- Pacific Northwest National Laboratory, Richland, Washington 99352
| | | | - T Sumiyoshi
- Tokyo Metropolitan University, Tokyo 192-0397
| | - K Suzuki
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - M Takizawa
- J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
- Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198
- Showa Pharmaceutical University, Tokyo 194-8543
| | - U Tamponi
- INFN-Sezione di Torino, 10125 Torino
| | - K Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
| | - Y Tao
- University of Florida, Gainesville, Florida 32611
| | - F Tenchini
- School of Physics, University of Melbourne, Victoria 3010
| | - M Uchida
- Tokyo Institute of Technology, Tokyo 152-8550
| | - T Uglov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - S Uno
- SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
| | - P Urquijo
- School of Physics, University of Melbourne, Victoria 3010
| | - Y Usov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - S E Vahsen
- University of Hawaii, Honolulu, Hawaii 96822
| | - C Van Hulse
- University of the Basque Country UPV/EHU, 48080 Bilbao
| | - G Varner
- University of Hawaii, Honolulu, Hawaii 96822
| | - V Vorobyev
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Novosibirsk State University, Novosibirsk 630090
| | - A Vossen
- Duke University, Durham, North Carolina 27708
| | - B Wang
- University of Cincinnati, Cincinnati, Ohio 45221
| | - C H Wang
- National United University, Miao Li 36003
| | - M-Z Wang
- Department of Physics, National Taiwan University, Taipei 10617
| | - P Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - X L Wang
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
| | | | - S Watanuki
- Department of Physics, Tohoku University, Sendai 980-8578
| | - E Widmann
- Stefan Meyer Institute for Subatomic Physics, Vienna 1090
| | - E Won
- Korea University, Seoul 136-713
| | - H Ye
- Deutsches Elektronen-Synchrotron, 22607 Hamburg
| | - C Z Yuan
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
| | - Y Yusa
- Niigata University, Niigata 950-2181
| | - S Zakharov
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Institute of Physics and Technology, Moscow Region 141700
| | - Z P Zhang
- University of Science and Technology of China, Hefei 230026
| | - V Zhilich
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
| | - V Zhukova
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
- Moscow Physical Engineering Institute, Moscow 115409
| | - V Zhulanov
- Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
- Novosibirsk State University, Novosibirsk 630090
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14
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Kohri H, Shiu SH, Chang WC, Yanai Y, Ahn DS, Ahn JK, Chen JY, Daté S, Ejiri H, Fujimura H, Fujiwara M, Fukui S, Gohn W, Hicks K, Hosaka A, Hotta T, Hwang SH, Imai K, Ishikawa T, Joo K, Kato Y, Kon Y, Lee HS, Maeda Y, Mibe T, Miyabe M, Morino Y, Muramatsu N, Nakano T, Nakatsugawa Y, Nam SI, Niiyama M, Noumi H, Ohashi Y, Ohta T, Oka M, Parker JD, Rangacharyulu C, Ryu SY, Sawada T, Shimizu H, Strokovsky EA, Sugaya Y, Sumihama M, Tsunemi T, Uchida M, Ungaro M, Wang SY, Yosoi M. Differential Cross Section and Photon-Beam Asymmetry for the γ[over →]p → π^{-}Δ^{++}(1232) Reaction at Forward π^{-} Angles for E_{γ}=1.5-2.95 GeV. Phys Rev Lett 2018; 120:202004. [PMID: 29864366 DOI: 10.1103/physrevlett.120.202004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 03/11/2018] [Indexed: 06/08/2023]
Abstract
Differential cross sections and photon-beam asymmetries for the γ[over →]p→π^{-}Δ^{++}(1232) reaction have been measured for 0.7<cosθ_{π}^{c.m.}<1 and E_{γ}=1.5-2.95 GeV at SPring-8/LEPS. The first-ever high statistics cross-section data are obtained in this kinematical region, and the asymmetry data for 1.5<E_{γ}(GeV)<2.8 are obtained for the first time. This reaction has a unique feature for studying the production mechanisms of a pure uu[over ¯] quark pair in the final state from the proton. Although there is no distinct peak structure in the cross sections, a non-negligible excess over the theoretical predictions is observed at E_{γ}=1.5-1.8 GeV. The asymmetries are found to be negative in most of the present kinematical regions, suggesting the dominance of π exchange in the t channel. The negative asymmetries at forward meson production angles are different from the asymmetries previously measured for the photoproduction reactions producing a dd[over ¯] or an ss[over ¯] quark pair in the final state. Advanced theoretical models introducing nucleon resonances and additional unnatural-parity exchanges are needed to reproduce the present data.
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Affiliation(s)
- H Kohri
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - S H Shiu
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
- Department of Physics, National Central University, Taoyuan City 32001, Taiwan
| | - W C Chang
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - Y Yanai
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - D S Ahn
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - J Y Chen
- Light Source Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S Daté
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
| | - H Ejiri
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Fujimura
- Wakayama Medical College, Wakayama 641-8509, Japan
| | - M Fujiwara
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- National Institutes for Quantum and Radiological Science and Technology, Tokai, Ibaraki 319-1195, Japan
| | - S Fukui
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - W Gohn
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA
| | - K Hicks
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
| | - A Hosaka
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Hotta
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S H Hwang
- Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - K Imai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - T Ishikawa
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - K Joo
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA
| | - Y Kato
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Y Kon
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H S Lee
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 34047, Korea
| | - Y Maeda
- Proton Therapy Center, Fukui Prefectural Hospital, Fukui 910-8526, Japan
| | - T Mibe
- High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - M Miyabe
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - Y Morino
- High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - N Muramatsu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - T Nakano
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Y Nakatsugawa
- High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - S I Nam
- Department of Physics, Pukyong National University (PKNU), Busan 608-737, Republic of Korea
| | - M Niiyama
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Noumi
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Y Ohashi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
| | - T Ohta
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - M Oka
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - J D Parker
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - C Rangacharyulu
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - S Y Ryu
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Sawada
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
- Physics Department, University of Michigan, Michigan 48109-1040, USA
| | - H Shimizu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - E A Strokovsky
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
- Joint Institute for Nuclear Research, Dubna, Moscow Region 142281, Russia
| | - Y Sugaya
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - M Sumihama
- Department of Education, Gifu University, Gifu 501-1193, Japan
| | - T Tsunemi
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - M Uchida
- Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - M Ungaro
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA
| | - S Y Wang
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - M Yosoi
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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15
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Yang SB, Ahn JK, Akazawa Y, Aoki K, Chiga N, Ekawa H, Evtoukhovitch P, Feliciello A, Fujita M, Hasegawa S, Hayakawa S, Hayakawa T, Honda R, Hosomi K, Hwang SH, Ichige N, Ichikawa Y, Ikeda M, Imai K, Ishimoto S, Kanatsuki S, Kim SH, Kinbara S, Kobayashi K, Koike T, Lee JY, Miwa K, Moon TJ, Nagae T, Nakada Y, Nakagawa M, Ogura Y, Sakaguchi A, Sako H, Sasaki Y, Sato S, Shirotori K, Sugimura H, Suto S, Suzuki S, Takahashi T, Tamura H, Tanida K, Togawa Y, Tsamalaidze Z, Ukai M, Wang TF, Yamamoto TO. First Determination of the Level Structure of an sd-Shell Hypernucleus, _{Λ}^{19}F. Phys Rev Lett 2018; 120:132505. [PMID: 29694189 DOI: 10.1103/physrevlett.120.132505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 02/15/2018] [Indexed: 06/08/2023]
Abstract
We report on the first observation of γ rays emitted from an sd-shell hypernucleus, _{Λ}^{19}F. The energy spacing between the ground state doublet, 1/2^{+} and 3/2^{+} states, of _{Λ}^{19}F is determined to be 315.5±0.4(stat)_{-0.5}^{+0.6}(syst) keV by measuring the γ-ray energy of the M1(3/2^{+}→1/2^{+}) transition. In addition, three γ-ray peaks are observed and assigned as E2(5/2^{+}→1/2^{+}), E1(1/2^{-}→1/2^{+}), and E1(1/2^{-}→3/2^{+}) transitions. The excitation energies of the 5/2^{+} and 1/2^{-} states are determined to be 895.2±0.3(stat)±0.5(syst) and 1265.6±1.2(stat)_{-0.5}^{+0.7}(syst) keV, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing s- and p-shell hypernuclear data.
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Affiliation(s)
- S B Yang
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Korea
| | - Y Akazawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Aoki
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - N Chiga
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - H Ekawa
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - P Evtoukhovitch
- Joint Institute for Nuclear Research, Dubna, Moscow Region 141980, Russia
| | - A Feliciello
- INFN, Sezione di Torino, via P. Giuria 1, 10125 Torino, Italy
| | - M Fujita
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S Hasegawa
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - S Hayakawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Hayakawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - R Honda
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - K Hosomi
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - S H Hwang
- Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea
| | - N Ichige
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - Y Ichikawa
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - M Ikeda
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Imai
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - S Ishimoto
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - S Kanatsuki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S H Kim
- Department of Physics, Korea University, Seoul 02841, Korea
| | - S Kinbara
- Faculty of Education, Gifu University, Gifu 501-1193, Japan
| | - K Kobayashi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Koike
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - J Y Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - K Miwa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - T J Moon
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - T Nagae
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Y Nakada
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - M Nakagawa
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Ogura
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - A Sakaguchi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - H Sako
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - Y Sasaki
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S Sato
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - K Shirotori
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Sugimura
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - S Suto
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - S Suzuki
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - T Takahashi
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - H Tamura
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - K Tanida
- Advanced Science Research Center (ASRC), Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
| | - Y Togawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - Z Tsamalaidze
- Joint Institute for Nuclear Research, Dubna, Moscow Region 141980, Russia
| | - M Ukai
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - T F Wang
- Research Center of Nuclear Science and Technology (RCNST) and School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
| | - T O Yamamoto
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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16
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Ahn JK, Hwang J, Hwang JH, Yoon WT, Chung PW, Ryu S. The association between serum uric acid and asymptomatic intracranial arterial stenosis in middle-aged Koreans. Nutr Metab Cardiovasc Dis 2018; 28:14-22. [PMID: 29191476 DOI: 10.1016/j.numecd.2017.10.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 09/07/2017] [Accepted: 10/17/2017] [Indexed: 12/27/2022]
Abstract
BACKGROUND AND AIMS Intracranial arterial stenosis (ICAS) is one of the most common causes of stroke, especially in Asians. Hyperuricemia has been associated with an increased risk of comorbidities such as metabolic syndrome or cardiovascular diseases. However, there are few studies focusing on the association between serum uric acid (SUA) levels and asymptomatic ICAS. The aim of this study was to explore the association between SUA and the prevalence of ICAS in middle-aged Korean health screening examinees. METHODS AND RESULTS A cross-sectional study was performed on 9417 males and 7755 females who underwent a comprehensive health examination including transcranial Doppler (TCD) ultrasonography. The association of SUA and ICAS was analyzed using multivariate logistic regression. The prevalence of ICAS among the total examinee population was 3.55%. In females, the multivariate-adjusted odds ratio for ICAS was 1.52 (confidence interval 1.13-2.04) in the 3rd quartile of SUA and 1.45 (1.05-2.00) in the highest quartile, compared to the reference (P for trend 0.008). This trend was evident in all clinically relevant subgroups evaluated, including women with low inflammation status. SUA was not significantly associated with the prevalence of ICAS among males. In a sensitivity analysis, the multivariate-adjusted odds ratio of middle cerebral artery stenosis in females was 1.60 (1.09-2.37) in the highest quartile compared to the reference (P for trend 0.023). CONCLUSIONS Higher SUA level was associated with increased risk of ICAS among middle-aged females but not males. A further cohort study is warranted to elucidate the effect of SUA on asymptomatic ICAS.
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Affiliation(s)
- J K Ahn
- Division of Rheumatology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea.
| | - J Hwang
- Department of Internal Medicine, National Police Hospital, Seoul, South Korea
| | - J H Hwang
- Center for Health Promotion, Samsung Medical Center, Seoul, South Korea
| | - W T Yoon
- Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - P W Chung
- Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - S Ryu
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea; Center for Cohort Studies, Total Healthcare Center, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea; Department of Clinical Research Design & Evaluation, SAIHST, Sungkyunkwan University, Seoul, South Korea.
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17
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Hwang J, Lee EK, Ahn JK, Cha HS, Koh EM, Lee J. Bone-density testing interval and transition to osteoporosis in patients with rheumatoid arthritis. Osteoporos Int 2017; 28:231-237. [PMID: 27509834 DOI: 10.1007/s00198-016-3703-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 07/06/2016] [Indexed: 01/30/2023]
Abstract
UNLABELLED The study aims to evaluate the rate of transition to osteoporosis in 360 RA patients and estimate the rescreening intervals of bone mineral density (BMD) testing. Osteoporosis was newly developed in 24.8 % during mean follow-up of 7.4 years. The estimated time of a BMD testing interval was dependent on the baseline T-score in RA patients. INTRODUCTION Although BMD testing is routinely performed in RA patients, the interval between BMD tests has not been determined. METHODS We retrospectively recruited 360 consecutive female patients with RA, who underwent repeated BMD testing, with a mean age of 53.7 ± 10.2 years and a mean follow-up duration of 7.4 ± 5.0 years. We stratified the study participants into five groups based on their baseline T-score range. The testing interval was defined as the estimated time for 10 % of patients in each subgroup to transition to osteoporosis. Competing-risk analyses were performed with sensitivity analysis by menopausal status and risk factors for transition to osteoporosis. RESULTS At baseline, 15 % of screened patients had osteoporosis, and during follow-up, that proportion increased to 24.8 %. The estimated BMD testing interval for 10 % of patients to develop osteoporosis was 9.6 years for those with normal BMD, 7.6 years for those with mild osteopenia, 4.7 years for those with moderate osteopenia, and 2.1 years for those with severe osteopenia. No significant risk factor for transition to osteoporosis was identified in this cohort. CONCLUSIONS Our data indicate that osteoporosis will develop in less than 10 % of female RA patients during rescreening intervals of approximately 9 years for those with normal bone density at baseline, 7 years for those with mild osteopenia, 4 years for those with moderate osteopenia, and 2 years for those with severe osteopenia at baseline. BMD interval in RA patients could be adjusted according to their baseline BMD T-scores.
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Affiliation(s)
- J Hwang
- Department of Internal Medicine, National Police Hospital, Seoul, South Korea
| | - E-K Lee
- Pharmaceutical Policy & Outcomes Research, Sungkyunkwan University School of Pharmacy, Suwon, South Korea
| | - J K Ahn
- Department of Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - H-S Cha
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea
| | - E-M Koh
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea
| | - J Lee
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 06351, South Korea.
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18
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Ryu SY, Ahn JK, Nakano T, Ahn DS, Ajimura S, Akimune H, Asano Y, Chang WC, Chen JY, Daté S, Ejiri H, Fujimura H, Fujiwara M, Fukui S, Hasegawa S, Hicks K, Horie K, Hotta T, Hwang SH, Imai K, Ishikawa T, Iwata T, Kato Y, Kawai H, Kino K, Kohri H, Kon Y, Kumagai N, Lin PJ, Maeda Y, Makino S, Matsuda T, Matsuoka N, Mibe T, Miyabe M, Miyachi M, Morino Y, Muramatsu N, Murayama R, Nakatsugawa Y, Nam SI, Niiyama M, Nomachi M, Ohashi Y, Ohkuma H, Ohta T, Ooba T, Oshuev DS, Parker JD, Rangacharyulu C, Sakaguchi A, Sawada T, Shagin PM, Shiino Y, Shimizu H, Strokovsky EA, Sugaya Y, Sumihama M, Tokiyasu AO, Toi Y, Toyokawa H, Tsunemi T, Uchida M, Ungaro M, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Interference Effect between ϕ and Λ(1520) Production Channels in the γp→K^{+}K^{-}p Reaction near Threshold. Phys Rev Lett 2016; 116:232001. [PMID: 27341225 DOI: 10.1103/physrevlett.116.232001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Indexed: 06/06/2023]
Abstract
The ϕ-Λ(1520) interference effect in the γp→K^{+}K^{-}p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between ϕ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when K^{+}K^{-} pairs are observed at forward angles but destructive interference for proton emission at forward angles. Furthermore, the observed interference effect does not account for the sqrt[s]=2.1 GeV bump structure in forward differential cross sections for ϕ photoproduction. This fact suggests possible exotic structures such as a hidden-strangeness pentaquark state, a new Pomeron exchange, or rescattering processes via other hyperon states.
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Affiliation(s)
- S Y Ryu
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - J K Ahn
- Department of Physics, Korea University, Seoul 02841, Republic of Korea
| | - T Nakano
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - D S Ahn
- RIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
| | - S Ajimura
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Akimune
- Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan
| | - Y Asano
- XFEL Project Head Office, RIKEN, Sayo, Hyogo 679-5143, Japan
| | - W C Chang
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - J Y Chen
- Light Source Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - S Daté
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
| | - H Ejiri
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Fujimura
- Wakayama Medical College, Wakayama 641-8509, Japan
| | - M Fujiwara
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S Fukui
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S Hasegawa
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - K Hicks
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
| | - K Horie
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Hotta
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S H Hwang
- Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - K Imai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - T Ishikawa
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - T Iwata
- Department of Physics, Yamagata University, Yamagata 990-8560, Japan
| | - Y Kato
- Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - H Kawai
- Department of Physics, Chiba University, Chiba 263-8522, Japan
| | - K Kino
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - H Kohri
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Y Kon
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - N Kumagai
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
| | - P J Lin
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - Y Maeda
- Proton Therapy Center, Fukui Prefectural Hospital, Fukui 910-8526, Japan
| | - S Makino
- Wakayama Medical College, Wakayama 641-8509, Japan
| | - T Matsuda
- Department of Applied Physics, Miyazaki University, Miyazaki 889-2192, Japan
| | - N Matsuoka
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Mibe
- High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - M Miyabe
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - M Miyachi
- Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - Y Morino
- High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - N Muramatsu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - R Murayama
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Nakatsugawa
- High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - S I Nam
- Department of Physics, Pukyong National University, Busan 48513, Republic of Korea
| | - M Niiyama
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - M Nomachi
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - Y Ohashi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
| | - H Ohkuma
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
| | - T Ohta
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - T Ooba
- Department of Physics, Chiba University, Chiba 263-8522, Japan
| | - D S Oshuev
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - J D Parker
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - C Rangacharyulu
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - A Sakaguchi
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - T Sawada
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - P M Shagin
- School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Y Shiino
- Department of Physics, Chiba University, Chiba 263-8522, Japan
| | - H Shimizu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - E A Strokovsky
- Joint Institute for Nuclear Research, Dubna, Moscow Region, 142281, Russia
| | - Y Sugaya
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - M Sumihama
- Department of Education, Gifu University, Gifu 501-1193, Japan
| | - A O Tokiyasu
- Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
| | - Y Toi
- Department of Applied Physics, Miyazaki University, Miyazaki 889-2192, Japan
| | - H Toyokawa
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
| | - T Tsunemi
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - M Uchida
- Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - M Ungaro
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA
| | - A Wakai
- Akita Research Institute of Brain and Blood Vessels, Akita 010-0874, Japan
| | - C W Wang
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - S C Wang
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - K Yonehara
- Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan
| | - T Yorita
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - M Yoshimura
- Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan
| | - M Yosoi
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - R G T Zegers
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
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19
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Han J, Lee KB, Park TS, Lee JM, Oh PJ, Lee SH, Kang YS, Ahn JK. 18F half-life measurement using a high-purity germanium detector. Appl Radiat Isot 2012; 70:2581-5. [PMID: 22940412 DOI: 10.1016/j.apradiso.2012.07.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 07/16/2012] [Accepted: 07/18/2012] [Indexed: 11/25/2022]
Abstract
The half-life of (18)F has been measured using HPGe detectors with a (137)Cs reference source. The counting ratio of 511 keV γ-rays from (18)F to 622 keV γ-rays from (137)Cs was fitted for the half-life with a weighted least-square method. Uncertainties due to the systematic effects arising from the measurement of a high activity (18)F source were studied in detail. The half-life of (18)F was found to be (109.72±0.19) min. The result is in a good agreement with the recommended value of (109.728±0.019) min evaluated at the Laborotaire National Henri Becquerel (LNHB).
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Affiliation(s)
- Jubong Han
- Korea Research Institute of Standards and Science, Daejeon 305-600, Republic of Korea
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20
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Ahn JK, Chebotaryov S, Choi JH, Choi S, Choi W, Choi Y, Jang HI, Jang JS, Jeon EJ, Jeong IS, Joo KK, Kim BR, Kim BC, Kim HS, Kim JY, Kim SB, Kim SH, Kim SY, Kim W, Kim YD, Lee J, Lee JK, Lim IT, Ma KJ, Pac MY, Park IG, Park JS, Park KS, Shin JW, Siyeon K, Yang BS, Yeo IS, Yi SH, Yu I. Observation of reactor electron antineutrinos disappearance in the RENO experiment. Phys Rev Lett 2012; 108:191802. [PMID: 23003027 DOI: 10.1103/physrevlett.108.191802] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Indexed: 06/01/2023]
Abstract
The RENO experiment has observed the disappearance of reactor electron antineutrinos, consistent with neutrino oscillations, with a significance of 4.9 standard deviations. Antineutrinos from six 2.8 GW(th) reactors at the Yonggwang Nuclear Power Plant in Korea, are detected by two identical detectors located at 294 and 1383 m, respectively, from the reactor array center. In the 229 d data-taking period between 11 August 2011 and 26 March 2012, the far (near) detector observed 17102 (154088) electron antineutrino candidate events with a background fraction of 5.5% (2.7%). The ratio of observed to expected numbers of antineutrinos in the far detector is 0.920±0.009(stat)±0.014(syst). From this deficit, we determine sin(2)2θ(13)=0.113±0.013(stat)±0.019(syst) based on a rate-only analysis.
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Affiliation(s)
- J K Ahn
- Department of Physics, Pusan National University, Busan, 609-735, Korea
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21
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Hwang SH, Hicks K, Ahn JK, Nakano T, Ahn DS, Chang WC, Chen JY, Daté S, Ejiri H, Fujimura H, Fujiwara M, Fukui S, Gohn W, Hotta T, Imai K, Ishikawa T, Joo K, Kato Y, Kohri H, Kon Y, Lee HS, Maeda Y, Miyabe M, Mibe T, Morino Y, Muramatsu N, Nakatsugawa Y, Niiyama M, Noumi H, Oh Y, Ohashi Y, Ohta T, Oka M, Parker J, Rangacharyulu C, Ryu SY, Sawada T, Sugaya Y, Sumihama M, Tsunemi T, Uchida M, Ungaro M, Yosoi M. Spin-density matrix elements for γp→K*0Σ+ at Eγ=1.85-3.0 GeV with evidence for the κ(800) meson exchange. Phys Rev Lett 2012; 108:092001. [PMID: 22463625 DOI: 10.1103/physrevlett.108.092001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Indexed: 05/31/2023]
Abstract
The exclusive reaction γp→K(+)π(-)Σ(+) was measured for the first time using linearly polarized photons at beam energies from 1.85 to 2.96 GeV. Angular distributions in the rest frame of the K(+)π(-) system were fitted to extract spin-density matrix elements of the K(*0) decay. The measured parity spin asymmetry shows that natural-parity exchange is dominant in this reaction. This result clearly indicates the need for t-channel exchange of the κ(800) scalar meson.
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Affiliation(s)
- S H Hwang
- Department of Physics, Pusan National University, Busan 609-735, Republic of Korea
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Abstract
BACKGROUND To assess diagnostic efficacy of plasma total homocysteine (tHcy) and C-reactive protein (CRP) levels for ocular ischemic syndrome (OIS). METHODS In all, 87 patients with retinal vein occlusion (RVO), 955 patients with a stenosis of internal carotid artery (ICA) <90% and 159 patients with a stenosis of ICA >90% were included between 2003 and 2009. A total of 43 patients with a stenosis ICA >90% were diagnosed as OIS. Fasting tHcy, CRP, lipid profiles, creatinine were measured, and diagnostic values of hyperhomocysteinemia or elevated CRP for OIS were evaluated. RESULT The mean plasma levels of tHcy (18.8 μmol/l) and CRP (1.1 mmol/l) were the highest in patients with OIS among the groups. The prevalences of hyperhomocysteinemia (72%) and elevated CRP (77%) were the highest in OIS among the groups. In patients with stenosis of ICA, the diagnostic sensitivity/specificity for OIS was 70/79% in hyperhomocysteinemia and 73/73% in elevated CRP. The diagnostic sensitivity and specificity for OIS were 53 and 86% in both hyperhomocysteinemia and elevated CRP. The lipid profiles and creatinine levels were similar among the groups. CONCLUSION Our results suggest that hyperhomocysteinemia and elevated CRP may be associated with the development of OIS. The measurements of tHcy and CRP in blood may help to assist the diagnosis of OIS in a stenosis of ICA.
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Affiliation(s)
- I H Hong
- Department of Ophthalmology, Kangdong Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea
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23
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Ahn JK, Kim JS, Lee HM, Kim H, Kim TH, Park JN, Kang YS, Lee HS, Kim SJ, Park JY, Ryu SY, Kim HC, Kang WG, Kim SK. Measurement limits to 134Cs concentration in soil. Appl Radiat Isot 2011; 69:1294-8. [PMID: 21592803 DOI: 10.1016/j.apradiso.2011.05.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Revised: 01/10/2011] [Accepted: 05/03/2011] [Indexed: 10/18/2022]
Abstract
We investigate the caesium concentrations in soils in mountain areas near Gori nuclear power plant in Korea, focusing on the measurement limits to the (134)Cs. In order to lower the minimum detectable amount (MDA) of activity for the (134)Cs, we have used the ammonium molybdophosphate (AMP) precipitation method to get rid of the (40)K existing in natural radioactivity, which reduces the MDA activity about 10 times smaller than those without the AMP precipitation method. The MDA results for the (134)Cs were found to be in the range between 0.015 and 0.044 Bq/kg-dry weight. In order to diminish the background, we also have measured a part of the soil samples in Yangyang, a small town in the east coast of Korea. However, it turns out that in order to detect the (134)Cs in the samples the MDA should be reduced to the level of mBq/kg-dry weight.
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Affiliation(s)
- J K Ahn
- Department of Physics, Pusan National University, Pusan, Republic of Korea
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Lee J, Oh JM, Hwang JW, Ahn JK, Bae EK, Won J, Koh EM, Cha HS. Expression of human TIM-3 and its correlation with disease activity in rheumatoid arthritis. Scand J Rheumatol 2011; 40:334-40. [PMID: 21446887 DOI: 10.3109/03009742.2010.547871] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVE T-cell immunoglobulin- and mucin-domain-containing molecule 3 (TIM-3) is a novel transmembrane protein that is involved in the regulation of T-helper 1 (Th1)-cell-mediated immunity. This study was undertaken to investigate the expressions of TIM-3 and its ligand galectin 9 (Gal-9) with respect to disease activity in rheumatoid arthritis (RA). METHODS Blood was collected from 39 RA patients and 31 healthy controls. Blood leucocyte TIM-3 and Gal-9 mRNA levels and RA disease activity were determined. Synovial tissue (ST) from five RA patients and five osteoarthritis (OA) patients were examined for TIM-3 mRNA expression and were also analysed for TIM-3 by immunohistology. RESULTS TIM-3 mRNA expression was significantly higher in the ST of RA patients than in the ST of OA patients. TIM-3 was expressed in the synovial sublining area in ST of RA patients but not in OA ST. TIM-3 mRNA expression from peripheral blood mononuclear cells (PBMCs) of RA patients was negatively correlated with the 28-joint Disease Activity Score (DAS28). Gal-9 mRNA level in PBMCs of RA patients was higher than in healthy controls, and was significantly higher in patients with low disease activity compared to those with moderate to high disease activity. Gal-9 mRNA expression in PBMCs of RA patients was positively correlated with forkhead box P3 (FoxP3) mRNA expression. CONCLUSION TIM-3 and its interaction with Gal-9 are closely associated with RA disease activity and may play an important role in the pathogenesis of RA. In addition to the negative regulatory effect of Gal-9 mediated through the TIM-3-Gal-9 pathway, Gal-9 may exert its suppressive effect on RA disease activity by modulation of regulatory T (Treg) cells.
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Affiliation(s)
- J Lee
- Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
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25
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Nam ES, Kim MS, Lee HB, Ahn JK. Beta-glycosidase of Thermus thermophilus KNOUC202: gene and biochemical properties of the enzyme expressed in Escherichia coli. Prikl Biokhim Mikrobiol 2010; 46:562-571. [PMID: 21058504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The beta-glycosidase gene of Thermus thermophilus KNOUC202 was cloned, expressed in Escherichia coli JM109(DE3), and the enzyme was purified and characterized. The gene (KNOUC202/beta-gly) was composed of 1296 bp encoding a beta-glycosidase (KNOUC202beta-glycosidase) of 431 a.a., belonging to the family 1 of glycosyl hydrolase. The gene was expressed as monomer of 430 a.a. with amino terminal methionine excised in E. coli JM109(DE3). The enzyme hydrolyzed beta-glycosides whose glycone are galactose, glucose and fucose well, however showed no or very low activity on beta-D-glycosides whose glycone are disaccharides and xylose. kcat of the enzyme for the hydrolysis of p-Nph-beta-D-Glcp was lower than those for p-Nph-beta-D-Galp and ONPG, however K(m) for p-Nph-beta-D-Glcp was highly lower than those for p-Nph-beta-D-Galp and ONPG resulting in the catalytic efficiency(k(cat)/K(m)) for the hydrolysis of p-Nph-beta-D-Glcp much higher than those for p-Nph-beta-D-Galp and ONPG. Optimum pH and optimum temperature of the enzyme were pH 5.4 and 90 degrees C. The enzyme has high thermostability, not losing its activity at 80 degrees C for 2 h in 0.05 M Na-phosphate buffer of pH 6.8 with T(m) of 100.0 +/- 0.031 degrees C in 0.02 M Tris-HCl buffer of pH 8.2. The beta-glycosidase produced a disaccharide composed of galactose as transglycosylation byproduct during hydrolysis of lactose.
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Affiliation(s)
- E S Nam
- Department ofAgricultural Sciences, Korea National Open University, Seoul 110- 797, Republic of Korea
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26
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Kohri H, Ahn DS, Ahn JK, Akimune H, Asano Y, Chang WC, Daté S, Ejiri H, Fukui S, Fujimura H, Fujiwara M, Hasegawa S, Hicks K, Hosaka A, Hotta T, Imai K, Ishikawa T, Iwata T, Kawai H, Kim ZY, Kino K, Kumagai N, Makino S, Matsuda T, Matsumura T, Matsuoka N, Mibe T, Miyabe M, Miyachi Y, Morita M, Muramatsu N, Nakano T, Nam SI, Niiyama M, Nomachi M, Ohashi Y, Ohkuma H, Ooba T, Oshuev DS, Rangacharyulu C, Sakaguchi A, Sasaki T, Shagin PM, Shiino Y, Shimizu A, Shimizu H, Sugaya Y, Sumihama M, Titov AI, Toi Y, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Near-threshold Lambda(1520) production by the gamma(p)-->K{+}Lambda(1520) reaction at forward K+ angles. Phys Rev Lett 2010; 104:172001. [PMID: 20482102 DOI: 10.1103/physrevlett.104.172001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2009] [Indexed: 05/29/2023]
Abstract
Differential cross sections and photon-beam asymmetries for the gamma(p)-->K{+}Lambda(1520) reaction have been measured with linearly polarized photon beams at energies from the threshold to 2.4 GeV at 0.6<cos(theta){c.m.}{K}<1. A new bump structure was found at W approximately 2.11 GeV in the cross sections. The bump is not well reproduced by theoretical calculations introducing a nucleon resonance with J<or=3/2. This result suggests that the bump might be produced by a nucleon resonance possibly with J>or=5/2 or by a new reaction process, for example, an interference effect with the phi photoproduction having a similar bump structure in the cross sections.
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Affiliation(s)
- H Kohri
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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Muramatsu N, Chen JY, Chang WC, Ahn DS, Ahn JK, Akimune H, Asano Y, Daté S, Ejiri H, Fujimura H, Fujiwara M, Fukui S, Hasegawa S, Hicks K, Horie K, Hotta T, Imai K, Ishikawa T, Iwata T, Kato Y, Kawai H, Kino K, Kohri H, Kumagai N, Makino S, Matsuda T, Matsumura T, Matsuoka N, Mibe T, Miyabe M, Miyachi M, Nakano T, Niiyama M, Nomachi M, Ohashi Y, Ohkuma H, Ooba T, Oshuev DS, Rangacharyulu C, Sakaguchi A, Shagin PM, Shiino Y, Shimizu H, Sugaya Y, Sumihama M, Toi Y, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Near-threshold photoproduction of Lambda(1520) from protons and deuterons. Phys Rev Lett 2009; 103:012001. [PMID: 19659135 DOI: 10.1103/physrevlett.103.012001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2009] [Indexed: 05/28/2023]
Abstract
Photoproduction of Lambda(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K+/0 angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K+ angles.
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Affiliation(s)
- N Muramatsu
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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Tung YC, Hsiung YB, Wu ML, Chen KF, Ahn JK, Akune Y, Baranov V, Comfort J, Doroshenko M, Fujioka Y, Inagaki T, Ishibashi S, Ishihara N, Ishii H, Iwai E, Iwata T, Kato I, Kobayashi S, Komatsubara TK, Kurilin AS, Kuzmin E, Lednev A, Lee HS, Lee SY, Lim GY, Ma J, Matsumura T, Moisseenko A, Morii H, Morimoto T, Nakano T, Nanjo H, Nix J, Nomura T, Nomachi M, Ogata R, Okuno H, Omata K, Perdue GN, Podolsky S, Sakashita K, Sasaki T, Sasao N, Sato H, Sato T, Sekimoto M, Shinkawa T, Sugaya Y, Sugiyama A, Sumida T, Suzuki S, Tajima Y, Takita S, Tsamalaidze Z, Tsukamoto T, Wah Y, Watanabe H, Yamaga M, Yamanaka T, Yoshida HY, Yoshimura Y, Zheng Y. Search for a light pseudoscalar particle in the decay K_{L};{0}-->pi;{0}pi;{0}X. Phys Rev Lett 2009; 102:051802. [PMID: 19257503 DOI: 10.1103/physrevlett.102.051802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2008] [Indexed: 05/27/2023]
Abstract
We performed a search for a light pseudoscalar particle X in the decay K_{L};{0}-->pi;{0}pi;{0}X, X-->gammagamma with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/c;{2} was suggested by the HyperCP experiment. We found no evidence for X and set an upper limit on the product branching ratio for K_{L};{0}-->pi;{0}pi;{0}X, X-->gammagamma of 2.4x10;{-7} at the 90% confidence level. Upper limits on the branching ratios in the mass region of X from 194.3 to 219.3 MeV/c;{2} are also presented.
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Affiliation(s)
- Y C Tung
- Department of Physics, National Taiwan University, Taipei, Taiwan
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Hicks K, Keller D, Kohri H, Ahn DS, Ahn JK, Akimune H, Asano Y, Chang WC, Daté S, Ejiri H, Fukui S, Fujimura H, Fujiwara M, Hasegawa S, Hotta T, Imai K, Ishikawa T, Iwata T, Kato Y, Kawai H, Kim ZY, Kino K, Kumagai N, Makino S, Matsuda T, Matsumura T, Matsuoka N, Mibe T, Miyabe M, Miyachi Y, Morita M, Muramatsu N, Nakano T, Niiyama M, Nomachi M, Oh Y, Ohashi Y, Ohkuma H, Ooba T, Parker J, Rangacharyulu C, Sakaguchi A, Sasaki T, Shagin PM, Shiino Y, Shimizu A, Shimizu H, Sugaya Y, Sumihama M, Toi Y, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Cross sections and beam asymmetry for K;{+}Sigma;{*-} photoproduction from the deuteron at E_{gamma}=1.5-2.4 GeV. Phys Rev Lett 2009; 102:012501. [PMID: 19257183 DOI: 10.1103/physrevlett.102.012501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2008] [Indexed: 05/27/2023]
Abstract
The Sigma(1385) resonance, or Sigma;{*}, is well known as part of the standard baryon decuplet with spin J=3/2. Measurements of the reaction gammap-->K;{+}Sigma;{*0} are difficult to extract due to overlap with the nearby Lambda(1405) resonance. However, the reaction gamman-->K;{+}Sigma;{*-} has no overlap with the Lambda(1405) due to its charge. Here we report the first measurement of cross sections and beam asymmetries for photoproduction of the Sigma;{*-} from a deuteron target. The cross sections at forward angles range from 0.4 to 1.2 mub, with a broad maximum near E_{gamma} approximately 1.8 GeV. The beam asymmetries are negative, in contrast with positive values for the gamman-->K;{+}Sigma;{-} reaction.
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Affiliation(s)
- K Hicks
- Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
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Jeon CH, Ahn JK, Chai JY, Kim HJ, Bae EK, Park SH, Cho EY, Cha HS, Ahn KS, Koh EM. Hypoxia appears at pre-arthritic stage and shows co-localization with early synovial inflammation in collagen induced arthritis. Clin Exp Rheumatol 2008; 26:646-648. [PMID: 18799097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
OBJECTIVE The presence of hypoxia in rheumatoid synovium has been well known, but exact correlation between hypoxia and synovitis is unclear. The aim of our study was to investigate the time and spatial relationship and the correlation of severity between hypoxia and synovitis in pre-arthritic or early stage of inflammatory joint disease. METHODS DBA/1J mice were injected intradermally with type II collagen and adjuvant solution to induce arthritis; mice injected with only adjuvant were used as a control group. CIA and control mice were sacrificed weekly after the injection to evaluate serial pathological changes. H&E stain and hydroxyprobe-1 stain were performed to look at the status of inflammation and hypoxia. RESULTS In serial observations of tissue pathology, we could note the inflammation of synovium developing a week after the injection of type II collagen. Hypoxic change, measured by the hydroxyprobe-1 stain, was also identified in synovium as early as 1 week after the collagen injection, prior to clinically evident arthritis. In addition, we could observe that inflammation and hypoxia co-localize in the synovium and there was a positive correlation between the severity of hypoxia and the degree of synovitis. CONCLUSION Our results demonstrate that hypoxia takes place in synovium at the pre-arthritic stage of disease and have a close spatial relationship and a positive severity correlation with synovitis.
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Affiliation(s)
- C H Jeon
- Department of Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
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31
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Park KH, Bang JH, Park WB, Kim HB, Kim NJ, Ahn JK, Chang KH, Oh MD, Choe KW. Retrobulbar optic neuritis and meningoencephalitis following progressive outer retinal necrosis due to CMV in a patient with AIDS. Infection 2008; 36:475-9. [PMID: 18574556 DOI: 10.1007/s15010-007-6290-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Accepted: 05/03/2007] [Indexed: 11/26/2022]
Abstract
We report on a 34-year-old male patient with AIDS who developed retrobulbar optic neuritis and meningoencephalitis following bilateral progressive outer retinal necrosis (PORN) caused by cytomegalovirus (CMV). This case documents the presumed association of PORN with retrobulbar optic neuritis, and CMV meningoencephalitis in an AIDS patient.
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Affiliation(s)
- K H Park
- Department of Internal medicine, Seoul National University Hospital, 28 Youngun-dong, Chongro-gu, Seoul, South Korea
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32
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Ahn JK, Cha HS, Koh EM, Kim SH, Kim YG, Lee CK, Yoo B. Behcet's disease associated with bone marrow failure in Korean patients: clinical characteristics and the association of intestinal ulceration and trisomy 8. Rheumatology (Oxford) 2008; 47:1228-30. [PMID: 18550640 DOI: 10.1093/rheumatology/ken162] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
OBJECTIVES The aim of this study was to determine the clinical characteristics of Behcet's disease (BD) associated with bone marrow failure (BMF), classified as conditions such as myelodysplastic syndrome (MDS) or aplastic anaemia (AA), in Korea. METHODS A retrospective analysis was made of 13 patients with BD associated with BMF (MDS 8 cases, AA 5 cases) and 66 patients with BD not associated with BMF. These patients all fulfilled the diagnostic criteria of the international BD study group. RESULTS BD patients with BMF showed significantly lower leucocyte count, haemoglobin level and platelet count when compared with patients without BMF (P < 0.001). BD patients with BMF had significantly higher serum CRP level at the time of BD diagnosis compared with patients without BMF (P = 0.03). Intestinal lesions were more frequent in BD patients with BMF than those without BMF (61.5% vs 13.6%, P = 0.001). Cytogenetic abnormality was observed in 90.9% of BD patients with BMF. Of the cytogenetic abnormalities, trisomy 8 was most common, occurring in 70% of the patients. In four patients with refractory BD associated with BMF, successful treatment of BMF by haematopoietic stem cell transplantation resulted in clinical remission of BD. CONCLUSIONS Our study indicates that intestinal ulceration is a characteristic finding in BD associated with BMF. It also suggests that cytogenetic aberration, especially trisomy 8, may play an important role in the pathogenesis of BD associated with BMF.
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Affiliation(s)
- J K Ahn
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 IIwon-Dong, Gangnam-Gu, Seoul 135-710, Republic of Korea
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Ahn JK, Akune Y, Baranov V, Chen KF, Comfort J, Doroshenko M, Fujioka Y, Hsiung YB, Inagaki T, Ishibashi S, Ishihara N, Ishii H, Iwai E, Iwata T, Kato I, Kobayashi S, Komatsubara TK, Kurilin AS, Kuzmin E, Lednev A, Lee HS, Lee SY, Lim GY, Ma J, Matsumura T, Moisseenko A, Morii H, Morimoto T, Nakano T, Nanjo H, Nix J, Nomura T, Nomachi M, Okuno H, Omata K, Perdue GN, Podolsky S, Sakashita K, Sasaki T, Sasao N, Sato H, Sato T, Sekimoto M, Shinkawa T, Sugaya Y, Sugiyama A, Sumida T, Suzuki S, Tajima Y, Takita S, Tsamalaidze Z, Tsukamoto T, Tung YC, Wah YW, Watanabe H, Wu ML, Yamaga M, Yamanaka T, Yoshida HY, Yoshimura Y. Search for the Decay K L0-->pi0nu nu[over]. Phys Rev Lett 2008; 100:201802. [PMID: 18518524 DOI: 10.1103/physrevlett.100.201802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2007] [Indexed: 05/26/2023]
Abstract
We performed a search for the K L0-->pi0nu nu[over] decay at the KEK 12-GeV proton synchrotron. No candidate events were observed. An upper limit on the branching ratio for the decay was set to be 6.7 x 10(-8) at the 90% confidence level.
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Affiliation(s)
- J K Ahn
- Department of Physics, Pusan National University, Busan 609-735, Republic of Korea
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34
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Kim JC, Choi SH, Kim JK, Kim Y, Kim HJ, Im JS, Lee SY, Choi JM, Lee HM, Ahn JK. [Herpes simplex virus type 1 ICP27 induces apoptotic cell death by increasing intracellular reactive oxygen species]. Mol Biol (Mosk) 2008; 42:470-477. [PMID: 18702305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
HSV-1 ICP27, an immediate early protein of herpes simplex virus type 1, is involved in viral replication, transcriptional activation, RNA stability, apoptosis, and reactivation from viral latency. The reactivation from viral latency is closely related to apoptosis and oxidative stress. To understand the effect of ICP27 upon apoptosis, we tested for cell death of ICP27-expressing cells (3-3) in the presence of hydrogen peroxide. Under oxidative stress, 3-3 cells were sensitive to death, displaying typical apoptosis features such as oligonucleosomal DNA fragmentation, chromatin condensation, and G0/G1 accumulation. To dissect the sensitizing mechanism of ICP27 in apoptosis, we analyzed the level of intracellular reactive oxygen species (ROS) in 3-3 cells. We found that 3-3 cells exhibited increased ROS levels compared to Vero cells devoid of ICP27. We also observed that the increased levels of intracellular ROS in 3-3 cells were caused by disturbances in antioxidant enzymes. In 3-3 cells, the elevated ROS increased the AP-1 activity, subsequently the expression of Bax increased, and the expression of Bcl2 was reduced. In addition, 3-3 cells were sensitive to various apoptotic agents. Taken together, these results indicate that HSV-I ICP27 sensitizes the cells to apoptosis by elevating the intracellular levels of ROS.
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35
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Ahn JK, Koh EM, Cha HS, Lee YS, Kim J, Bae EK, Ahn KS. Role of hypoxia-inducible factor-1alpha in hypoxia-induced expressions of IL-8, MMP-1 and MMP-3 in rheumatoid fibroblast-like synoviocytes. Rheumatology (Oxford) 2008; 47:834-9. [PMID: 18400834 DOI: 10.1093/rheumatology/ken086] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES Hypoxia-inducible factor-1alpha (HIF-1alpha) is a master regulator in the cellular response to hypoxic conditions, and rheumatoid synovial tissue is known to exist under hypoxic conditions. Therefore, this study was conducted to determine the contribution of HIF-1alpha to hypoxia-induced MMP and cytokine production in fibroblast-like synoviocytes (FLS). METHODS RA FLS were transfected with either a plasmid that expresses HIF-1alpha or an empty vector as a control, and then cultured under normoxia (21% O(2)). Also, FLS were transfected with either HIF-1alpha small interfering RNA (siRNA) or control siRNA, and cultured under hypoxic conditions (1% O(2)). Following transfection, the amounts of MMP and cytokine mRNAs and HIF-1alpha protein were examined using real-time RT-PCR and western blotting, respectively. RESULTS The expression of HIF-1alpha, MMP-1, MMP-3, IL-6 and IL-8 was markedly enhanced in FLS that were cultured under hypoxia. We confirmed that transient transfection of HIF-1alpha overexpressing vector or siRNA had occurred using western blotting, and in vitro studies conducted using FLS transfected with HIF-1alpha overexpression vector showed that they had significantly increased MMP-1, MMP-3 and IL-8 expression levels. Further, hypoxia-induced MMP-3 expression was significantly attenuated by knock-down of HIF-1alpha, whereas hypoxia-induced IL-8 or MMP-1 expression was not significantly repressed by HIF-1alpha siRNA. CONCLUSIONS Hypoxia-induced MMP-3 expression is exclusively regulated by HIF-1alpha, and hypoxia-induced MMP-1 or IL-8 expression appears to have salvage pathways other than the HIF-1alpha pathway. Together, these data provide new insight regarding the mechanism by which hypoxia participates in joint inflammation and destruction in RA.
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Affiliation(s)
- J K Ahn
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 IIwon-Dong, Gangnam-Gu, Seoul 135-710, Republic of Korea
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Kim SB, Chae GW, Lee J, Park J, Tak H, Chung JH, Park TG, Ahn JK, Joe CO. Activated Notch1 interacts with p53 to inhibit its phosphorylation and transactivation. Cell Death Differ 2006; 14:982-91. [PMID: 17186020 DOI: 10.1038/sj.cdd.4402083] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
We propose a biochemical mechanism for the negative role of Notch signaling on p53 transactivation function. Expression of the intracellular domain of human Notch1 (Notch1-IC) inhibits the expression of p53-responsive genes p21, mdm2, and bax in HCT116 p53(-/-) cells. Furthermore, Notch1-IC expression inhibits the phosphorylation of ectopically expressed p53 in HCT116 p53(-/-) cells as well as the phosphorylation of endogenous p53 in UV-treated HCT116 p53(+/+) cells. Transcriptional downregulation of p53-responsive genes by Notch1-IC was confirmed both by chromatin immunoprecipitation assay and Northern blot analysis. We found the intracellular interaction between Notch1-IC and p53 in HCT116 p53(+/+) cells and suggest that activated Notch1 interaction with p53 is an important cellular event for the inhibition of p53-dependent transactivation. The N-terminal fragment of Notch1-IC, which can interacts with p53, inhibits p53 phosphorylation and represses p53 transactivation. In addition, Notch signaling downregulated p53-dependent apoptosis induced by UV irradiation.
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Affiliation(s)
- S B Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, South Korea
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37
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Kohri H, Ahn DS, Ahn JK, Akimune H, Asano Y, Chang WC, Date' S, Ejiri H, Fukui S, Fujimura H, Fujiwara M, Hasegawa S, Hicks K, Hotta T, Imai K, Ishikawa T, Iwata T, Kawai H, Kim ZY, Kino K, Kumagai N, Makino S, Mart T, Matsuda T, Matsumura T, Matsuoka N, Mibe T, Miyabe M, Miyachi Y, Morita M, Muramatsu N, Nakano T, Niiyama M, Nomachi M, Ohashi Y, Ohkuma H, Ooba T, Oshuev DS, Rangacharyulu C, Sakaguchi A, Sasaki T, Shagin PM, Shiino Y, Shimizu A, Shimizu H, Sugaya Y, Sumihama M, Toi Y, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Differential cross section and photon-beam asymmetry for the gamma n --> K+ Sigma- reaction at E gamma = 1.5-2.4 GeV. Phys Rev Lett 2006; 97:082003. [PMID: 17026294 DOI: 10.1103/physrevlett.97.082003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2006] [Indexed: 05/12/2023]
Abstract
Differential cross sections and photon-beam asymmetries have been measured for the gamma n --> K+ Sigma- and gamma p --> K+Sigma0 reactions separately using liquid deuterium and hydrogen targets with incident linearly polarized photon beams of E gamma = 1.5-2.4 GeV at 0.6 < cos ThetacmK< 1. The cross section ratio of sigma K+ Sigma-/sigma K+ Sigma0, expected to be 2 on the basis of the isospin 1/2 exchange, is found to be close to 1. For the K+ Sigma- reaction, large positive asymmetries are observed, indicating the dominance of K* exchange. The large difference between the asymmetries for the K+ Sigma- and K+ Sigma0 reactions cannot be explained by simple theoretical considerations based on Regge model calculations.
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Affiliation(s)
- H Kohri
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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38
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Hwang JM, Ahn JK. Reply to A Franceschetti. Eye (Lond) 2006. [DOI: 10.1038/sj.eye.6701807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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39
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Mibe T, Chang WC, Nakano T, Ahn DS, Ahn JK, Akimune H, Asano Y, Daté S, Ejiri H, Fujimura H, Fujiwara M, Hicks K, Hotta T, Imai K, Ishikawa T, Iwata T, Kawai H, Kim ZY, Kino K, Kohri H, Kumagai N, Makino S, Matsuda T, Matsumura T, Matsuoka N, Miwa K, Miyabe M, Miyachi Y, Morita M, Muramatsu N, Niiyama M, Nomachi M, Ohashi Y, Ooba T, Ohkuma H, Oshuev DS, Rangacharyulu C, Sakaguchi A, Sasaki T, Shagin PM, Shiino Y, Shimizu H, Sugaya Y, Sumihama M, Titov AI, Toi Y, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Near-threshold diffractive psi-meson photoproduction from the proton. Phys Rev Lett 2005; 95:182001. [PMID: 16383894 DOI: 10.1103/physrevlett.95.182001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2005] [Revised: 10/12/2005] [Indexed: 05/05/2023]
Abstract
Photoproduction of a phi meson on protons was studied by means of linearly polarized photons at forward angles in the low-energy region from threshold to Egamma = 2.37 GeV. The differential cross sections at t = -|t|min do not increase smoothly as Egamma increases but show a local maximum at around 2.0 GeV. The angular distributions demonstrate that phi mesons are photoproduced predominantly by helicity-conserving processes, and the local maximum is not likely due to unnatural-parity processes.
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Affiliation(s)
- T Mibe
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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40
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Saha PK, Fukuda T, Imoto W, Ahn JK, Ajimura S, Aoki K, Bhang HC, Fujioka H, Hotchi H, Hwang JI, Itabashi T, Kang BH, Kim HD, Kim MJ, Kishimoto T, Krutenkova A, Maruta T, Miura Y, Miwa K, Nagae T, Noumi H, Outa H, Ohtaki T, Sakaguchi A, Sato Y, Sekimoto M, Shimizu Y, Tamura H, Tanida K, Toyoda A, Ukai M, Yim HJ. Production of the neutron-rich hypernucleus 10LambdaLi in the (pi-,K+) double charge-exchange reaction. Phys Rev Lett 2005; 94:052502. [PMID: 15783631 DOI: 10.1103/physrevlett.94.052502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2004] [Indexed: 05/24/2023]
Abstract
In order to produce a neutron-rich Lambda hypernucleus for the first time, we carried out an experiment by utilizing the (pi-,K+) double charge-exchange reaction on a 10B target. We observed the production of a 10LambdaLi hypernucleus. The cross section for the Lambda bound region was found to be 11.3+/-1.9 nb/sr with the 1.2 GeV/c incident momentum, which is compared with the 10LambdaB hypernucleus production cross section, 7.8+/-0.3 microb/sr, in the (pi+,K+) reaction with a 1.05 GeV/c incident momentum beam.
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Affiliation(s)
- P K Saha
- Osaka Electro-Communication University, Neyagawa, Osaka 572-8530, Japan
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41
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Abstract
AIMS/PURPOSE To evaluate the efficacy of occlusion therapy initiated after 9 years of age. METHODS A total of 16 amblyopes of 9 years or older (range, 9.0-14.5 years; mean, 10.5 years) with a difference in visual acuity of over two lines between the eyes alter 4 weeks of first full-time spectacle wear were included. None of the children had undergone a previous ocular examination, had ever worn spectacles, received occlusion therapy, or had strabismus surgery. Initial worst visual acuity after 4 weeks of full-time spectacle wear was 20/100 in three patients, between 20/80 and 20/40 in 11 patients, and 20/30 in two patients. Full-time occlusion was performed in 14 patients and part-time occlusion in two patients. RESULTS The final visual acuity of 15 out of 16 patients (94%) improved at least two lines. The final visual acuities ranged from 20/30 to 20/20 in 14 patients, 20/40 in one patient, and 20/50 in one remaining patient who began amblyopia therapy at 14.5 years of age, with the poorest compliance among the patients. CONCLUSIONS Occlusion therapy for anisometropic and strabismic amblyopia can be successful even if initiated after the age of 9 years.
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Affiliation(s)
- K H Park
- Department of Ophthalmology, Seoul National University, Bundang Hospital, College of Medicine, Seoul National University Sungnam, Korea
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42
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Yu HG, Lee DS, Seo JM, Ahn JK, Yu YS, Lee WJ, Chung H. The number of CD8+ T cells and NKT cells increases in the aqueous humor of patients with Behçet's uveitis. Clin Exp Immunol 2004; 137:437-43. [PMID: 15270864 PMCID: PMC1809124 DOI: 10.1111/j.1365-2249.2004.02536.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
To determine whether there are differences in the immunopathogenesis of different endogenous uveitis syndromes, the phenotypic characteristics of immune cells were analysed among patients with endogenous uveitis. The aetiology of the uveitis included idiopathic recurrent acute anterior uveitis (18 patients), idiopathic intermediate uveitis (13 patients), Behçet's uveitis (17 patients), Vogt-Koyanagi-Harada syndrome (7 patients), and so on. Flow cytometric analysis was performed using immune cells of the aqueous humor and the peripheral blood during the active phase of intraocular inflammation, and monoclonal antibodies to CD3, CD4, CD8, CD14, CD19, CD56, TCR gammadelta, pan TCR alphabeta and Valpha24. CD8+ T cells were predominant in the aqueous humor of the patients with Behçet's uveitis, whereas CD4+ T cells were mainly found in the aqueous humor of patients other than those with Behçet's uveitis. The number of NKT (CD3+CD56+) cells was significantly higher both in the aqueous humor and the peripheral blood of the patients with Behçet's uveitis compared with the other groups (P < 0.05). CD8+CD56+ cells were the predominant subtype of the increased NKT cells in patients with Behçet's uveitis. In addition, intraocular infiltration of CD14+ cells significantly differed among the uveitis patients (P < 0.05). These results suggest that the immunopathogenesis of endogenous uveitis can vary between syndromes, and that CD8+CD56+ NKT cells may play an important role in the immunopathogenesis of Behçet's uveitis.
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Affiliation(s)
- H G Yu
- Department of Ophthalmology, Seoul Artificial Eye Centre, Seoul National University Hospital Clinical Research Institute, Seoul, Korea
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43
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Cho JS, Ahn JK, Kim HC, Lee DW. Radon concentrations in groundwater in Busan measured with a liquid scintillation counter method. J Environ Radioact 2004; 75:105-112. [PMID: 15149764 DOI: 10.1016/j.jenvrad.2003.06.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2002] [Revised: 06/18/2003] [Accepted: 06/19/2003] [Indexed: 05/24/2023]
Abstract
In this paper, we present the first measurement of radon concentrations in drinking groundwater from private and public deep-bored wells located in the south-eastern area of Korea. The measurements were carried out on 439 samples by using a liquid scintillation method. The results show that the radon concentrations of the samples range from 0 to about 300 Bq l(-1). We find that Sasang ward shows the highest median value of radon concentration among 13 different wards, while Jung ward has the lowest. We find that the radon concentrations are highly dependent on the type of geological rock aquifers.
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Affiliation(s)
- J S Cho
- Department of Physics, Pusan National University, 609-735 Busan, South Korea.
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44
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Zegers RGT, Sumihama M, Ahn DS, Ahn JK, Akimune H, Asano Y, Chang WC, Daté S, Ejiri H, Fujimura H, Fujiwara M, Hicks K, Hotta T, Imai K, Ishikawa T, Iwata T, Kawai H, Kim ZY, Kino K, Kohri H, Kumagai N, Makino S, Matsumura T, Matsuoka N, Mibe T, Miwa K, Miyabe M, Miyachi Y, Morita M, Muramatsu N, Nakano T, Niiyama M, Nomachi M, Ohashi Y, Ooba T, Ohkuma H, Oshuev DS, Rangacharyulu C, Sakaguchi A, Sasaki T, Shagin PM, Shiino Y, Shimizu H, Sugaya Y, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M. Beam-polarization asymmetries for the p(gamma-->, K+)Lambda and p(gamma-->, K+)Sigma(0) reactions for E(gamma)=1.5-2.4 GeV. Phys Rev Lett 2003; 91:092001. [PMID: 14525171 DOI: 10.1103/physrevlett.91.092001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2003] [Indexed: 05/24/2023]
Abstract
Beam polarization asymmetries for the p(gamma-->,K+)Lambda and p(gamma-->,K+)Sigma(0) reactions are measured for the first time for E(gamma)=1.5-2.4 GeV and 0.6<cos((theta(c.m.)(K+))<1.0 by using linearly polarized photons at the Laser-Electron-Photon facility at SPring-8 (LEPS). The observed asymmetries are positive and gradually increase with rising photon energy. The data are not consistent with theoretical predictions based on tree-level effective-Lagrangian approaches. Including the new results in the development of the models is, therefore, crucial for understanding the reaction mechanism and to test the presence of baryon resonances which are predicted in quark models but are thus far undiscovered.
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Affiliation(s)
- R G T Zegers
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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45
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Nakano T, Ahn DS, Ahn JK, Akimune H, Asano Y, Chang WC, Daté S, Ejiri H, Fujimura H, Fujiwara M, Hicks K, Hotta T, Imai K, Ishikawa T, Iwata T, Kawai H, Kim ZY, Kino K, Kohri H, Kumagai N, Makino S, Matsumura T, Matsuoka N, Mibe T, Miwa K, Miyabe M, Miyachi Y, Morita M, Muramatsu N, Niiyama M, Nomachi M, Ohashi Y, Ooba T, Ohkuma H, Oshuev DS, Rangacharyulu C, Sakaguchi A, Sasaki T, Shagin PM, Shiino Y, Shimizu H, Sugaya Y, Sumihama M, Toyokawa H, Wakai A, Wang CW, Wang SC, Yonehara K, Yorita T, Yoshimura M, Yosoi M, Zegers RGT. Evidence for a narrow S = +1 baryon resonance in photoproduction from the neutron. Phys Rev Lett 2003; 91:012002. [PMID: 12906534 DOI: 10.1103/physrevlett.91.012002] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2003] [Indexed: 05/24/2023]
Abstract
The gamman-->K(+)K(-)n reaction on 12C has been studied by measuring both K+ and K- at forward angles. A sharp baryon resonance peak was observed at 1.54+/-0.01 GeV/c(2) with a width smaller than 25 MeV/c(2) and a Gaussian significance of 4.6sigma. The strangeness quantum number (S) of the baryon resonance is +1. It can be interpreted as a molecular meson-baryon resonance or alternatively as an exotic five-quark state (uuddsmacr;) that decays into a K+ and a neutron. The resonance is consistent with the lowest member of an antidecuplet of baryons predicted by the chiral soliton model.
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Affiliation(s)
- T Nakano
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
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46
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Takahashi H, Ahn JK, Akikawa H, Aoki S, Arai K, Bahk SY, Baik KM, Bassalleck B, Chung JH, Chung MS, Davis DH, Fukuda T, Hoshino K, Ichikawa A, Ieiri M, Imai K, Iwata YH, Iwata YS, Kanda H, Kaneko M, Kawai T, Kawasaki M, Kim CO, Kim JY, Kim SJ, Kim SH, Kondo Y, Kouketsu T, Lee YL, McNabb JW, Mitsuhara M, Nagase Y, Nagoshi C, Nakazawa K, Noumi H, Ogawa S, Okabe H, Oyama K, Park HM, Park IG, Parker J, Ra YS, Rhee JT, Rusek A, Shibuya H, Sim KS, Saha PK, Seki D, Sekimoto M, Song JS, Takahashi T, Takeutchi F, Tanaka H, Tanida K, Tojo J, Torii H, Torikai S, Tovee DN, Ushida N, Yamamoto K, Yasuda N, Yang JT, Yoon CJ, Yoon CS, Yosoi M, Yoshida T, Zhu L. Observation of a (6)(LambdaLambda)He double hypernucleus. Phys Rev Lett 2001; 87:212502. [PMID: 11736336 DOI: 10.1103/physrevlett.87.212502] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2001] [Indexed: 05/23/2023]
Abstract
A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ( 6)(LambdaLambda)He emitted from a Xi(-) hyperon nuclear capture at rest. The mass of ( 6)(LambdaLambda)He and the Lambda-Lambda interaction energy DeltaB(LambdaLambda) have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of DeltaB(LambdaLambda) is 1.01+/-0.20(+0.18)(-0.11) MeV. This demonstrates that the Lambda-Lambda interaction is weakly attractive.
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Affiliation(s)
- H Takahashi
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
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47
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Ahn JK, Ajimura S, Akikawa H, Bassalleck B, Berdoz A, Carman D, Chrien RE, Davis CA, Eugenio P, Fischer H, Franklin GB, Franz J, Fukuda T, Gan L, Hotchi H, Ichikawa A, Imai K, Kahana SH, Khaustov P, Kishimoto T, Koran P, Kohri H, Kourepin A, Kubota K, Landry M, May M, Meyer C, Meziani Z, Minami S, Miyachi T, Nagae T, Nakano J, Outa H, Paschke K, Pile P, Prokhabatilov M, Quinn BP, Rasin V, Rusek A, Schmitt H, Schumacher RA, Sekimoto M, Shileev K, Shimizu Y, Sutter R, Tamagawa T, Tang L, Tanida K, Yamamoto K, Yuan L. Production of (4)(double Lambda)H hypernuclei. Phys Rev Lett 2001; 87:132504. [PMID: 11580581 DOI: 10.1103/physrevlett.87.132504] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2001] [Indexed: 05/23/2023]
Abstract
An experiment demonstrating the production of double-Lambda hypernuclei in (K(-),K(+)) reactions on (9)Be was carried out at the D6 line in the BNL alternating-gradient synchrotron. The technique was the observation of pions produced in sequential mesonic weak decay, each pion associated with one unit of strangeness change. The results indicate the production of a significant number of the double hypernucleus (4)(double Lambda)H and the twin hypernuclei (4)(Lambda)H and (3)(Lambda)H. The relevant decay chains are discussed and a simple model of the production mechanism is presented. An implication of this experiment is that the existence of an S = -2 dibaryon more than a few MeV below the double Lambda mass is unlikely.
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Affiliation(s)
- J K Ahn
- Department of Physics, Pusan National University, Pusan 609-735, Korea
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48
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Abstract
The biochemical path for the activation of ErbB-2 by PKC activator was investigated in MDA-MB-231 human breast cancer cells. We found that PMA-induced phosphorylation of myristoylated alanine-rich C kinase substrate (MARCKS) increased its binding with Tob that exerts an anti-proliferative effect through the binding with ErbB-2. The phosphorylation site domain (PSD) of MARCKS was relevant to its interaction with Tob. Decreased binding of Tob with ErbB-2 and subsequent activation of ErbB-2 were observed in MDA-MB-231 cells in response to PMA treatment. The present study proposes that MARCKS phosphorylation by PKC removes Tob from ErbB-2 by increasing its binding affinity with Tob, and thereby activates the ErbB-2 mediated signal transduction.
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Affiliation(s)
- S Jin Cho
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon, 305-701, Republic of Korea
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49
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Abstract
The activity of hammerhead ribozymes in S. cerevisiae was assessed using two ribozymes that were designed to intramolecularly attack the hepatitis B viral X mRNA. The ribozymes effectively suppressed the expression of the X-lacZ fusion gene, when they were inserted at the 5' end of the X mRNA. The ribozymes cleaved the target RNA efficiently at the targeted phosphodiester bond, but the inactive mutants carrying G5-to-A substitution in the core did not, as the total RNA preparations of yeast extracts was assayed by primer extension. These G5A mutants, however, exerted the suppression as effectively as the wild-type ribozymes. The results, with several mutations introduced to a ribozyme, suggested that either mere formation of hammerhead-like structures with the three stems, or the formation of any two stems, could inhibit translation. Thus, the hammerhead-like structures, leading to cleavage or not, could effectively suppress translation, especially when formed around the initiation codon. The G5-to-A and U7-to-G mutations and replacement of the stem-II hairpin tetraloop did not appear to affect the formation of the inhibitory structure(s). The inhibition that was observed when stems I and III were directly connected without a loop or with a stem II hairpin was completely relieved when they were connected with only the loop of stem II (not containing the stem portion).
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Affiliation(s)
- S H Yim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon, South Korea
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50
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Abstract
The poly(A) binding protein II gene (PAB II) has been highly conserved among mouse, bovine, and human. The promoter region of the murine PAB II gene (mPAB II) was investigated in this study. Primer extension analysis demonstrated that there are multiple sites for starting transcription. The promoter region of mPAB II gene contains a CpG island but lacks a TATA box, suggesting that the mPAB II mRNA is transcribed by a TATA-less promoter. Two transcription factor binding sites flanking the major transcription start site were confirmed by gel shift assay. The transcription level of the mPAB II gene in testis increases during spermatogenesis, and mPAB II protein accumulates densely in the nuclei of spermatocytes and round spermatids.
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Affiliation(s)
- Y J Lee
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon, South Korea
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