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Hashimoto T, Aikawa S, Akaishi T, Asano H, Bazzi M, Bennett DA, Berger M, Bosnar D, Butt AD, Curceanu C, Doriese WB, Durkin MS, Ezoe Y, Fowler JW, Fujioka H, Gard JD, Guaraldo C, Gustafsson FP, Han C, Hayakawa R, Hayano RS, Hayashi T, Hays-Wehle JP, Hilton GC, Hiraiwa T, Hiromoto M, Ichinohe Y, Iio M, Iizawa Y, Iliescu M, Ishimoto S, Ishisaki Y, Itahashi K, Iwasaki M, Ma Y, Murakami T, Nagatomi R, Nishi T, Noda H, Noumi H, Nunomura K, O'Neil GC, Ohashi T, Ohnishi H, Okada S, Outa H, Piscicchia K, Reintsema CD, Sada Y, Sakuma F, Sato M, Schmidt DR, Scordo A, Sekimoto M, Shi H, Shirotori K, Sirghi D, Sirghi F, Suzuki K, Swetz DS, Takamine A, Tanida K, Tatsuno H, Trippl C, Uhlig J, Ullom JN, Yamada S, Yamaga T, Yamazaki T, Zmeskal J. Measurements of Strong-Interaction Effects in Kaonic-Helium Isotopes at Sub-eV Precision with X-Ray Microcalorimeters. PHYSICAL REVIEW LETTERS 2022; 128:112503. [PMID: 35363014 DOI: 10.1103/physrevlett.128.112503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
We have measured the 3d→2p transition x rays of kaonic ^{3}He and ^{4}He atoms using superconducting transition-edge-sensor microcalorimeters with an energy resolution better than 6 eV (FWHM). We determined the energies to be 6224.5±0.4(stat)±0.2(syst) eV and 6463.7±0.3(stat)±0.1(syst) eV, and widths to be 2.5±1.0(stat)±0.4(syst) eV and 1.0±0.6(stat)±0.3(stat) eV, for kaonic ^{3}He and ^{4}He, respectively. These values are nearly 10 times more precise than in previous measurements. Our results exclude the large strong-interaction shifts and widths that are suggested by a coupled-channel approach and agree with calculations based on optical-potential models.
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Affiliation(s)
- T Hashimoto
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1184, Japan
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - S Aikawa
- Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - T Akaishi
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - H Asano
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - M Bazzi
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - D A Bennett
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - M Berger
- Stefan-Meyer-Institut für subatomare Physik, Vienna A-1030, Austria
| | - D Bosnar
- Department of Physics, Faculty of Science, University of Zagreb, Zagreb 10000, Croatia
| | - A D Butt
- Politecnico di Milano, Dipartimento di Elettronica, Milano 20133, Italy
| | - C Curceanu
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - W B Doriese
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - M S Durkin
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - Y Ezoe
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - J W Fowler
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - H Fujioka
- Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - J D Gard
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - C Guaraldo
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - F P Gustafsson
- Stefan-Meyer-Institut für subatomare Physik, Vienna A-1030, Austria
| | - C Han
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - R Hayakawa
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - R S Hayano
- Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
| | - T Hayashi
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
| | - J P Hays-Wehle
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - G C Hilton
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - T Hiraiwa
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
| | - M Hiromoto
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - Y Ichinohe
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
| | - M Iio
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - Y Iizawa
- Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - M Iliescu
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - S Ishimoto
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - Y Ishisaki
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - K Itahashi
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - M Iwasaki
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - Y Ma
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - T Murakami
- Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
| | - R Nagatomi
- Department of Physics, Osaka University, Toyonaka 560-0043, Japan
| | - T Nishi
- RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako 351-0198, Japan
| | - H Noda
- Department of Earth and Space Science, Osaka University, Toyonaka 560-0043, Japan
| | - H Noumi
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
| | - K Nunomura
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - G C O'Neil
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - T Ohashi
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - H Ohnishi
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
| | - S Okada
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
- Engineering Science Laboratory, Chubu University, Kasugai 487-8501, Japan
| | - H Outa
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - K Piscicchia
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - C D Reintsema
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - Y Sada
- Research Center for Electron Photon Science (ELPH), Tohoku University, Sendai 982-0826, Japan
| | - F Sakuma
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - M Sato
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - D R Schmidt
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - A Scordo
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - M Sekimoto
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - H Shi
- Stefan-Meyer-Institut für subatomare Physik, Vienna A-1030, Austria
| | - K Shirotori
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
| | - D Sirghi
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - F Sirghi
- Laboratori Nazionali di Frascati dell' INFN, Frascati I-00044, Italy
| | - K Suzuki
- Stefan-Meyer-Institut für subatomare Physik, Vienna A-1030, Austria
| | - D S Swetz
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - A Takamine
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - K Tanida
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1184, Japan
| | - H Tatsuno
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - C Trippl
- Stefan-Meyer-Institut für subatomare Physik, Vienna A-1030, Austria
| | - J Uhlig
- Chemical Physics, Lund University, Lund 22100, Sweden
| | - J N Ullom
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - S Yamada
- Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
| | - T Yamaga
- RIKEN Cluster for Pioneering Research, RIKEN, Wako 351-0198, Japan
| | - T Yamazaki
- Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
| | - J Zmeskal
- Stefan-Meyer-Institut für subatomare Physik, Vienna A-1030, Austria
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Abstract
In recent years, the absence of experimental evidence for searches dedicated to dark matter has triggered the development of new ideas on the nature of this entity, which manifests at the cosmological level. Some of these can be explored by small experiments with a short timescale and an investment that can be afforded by national laboratories, such as the Frascati one. This is the main reason why a laboratory that, traditionally, was focused in particle physics studies with accelerators has begun intense activity in this field of research.
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Adamczewski-Musch J, Arnold O, Atomssa ET, Behnke C, Belounnas A, Belyaev A, Berger-Chen JC, Biernat J, Blanco A, Blume C, Böhmer M, Chernenko S, Chlad L, Chudoba P, Ciepał I, Deveaux C, Dittert D, Dreyer J, Epple E, Fabbietti L, Fateev O, Fonte P, Franco C, Friese J, Fröhlich I, Galatyuk T, Garzón JA, Gernhäuser R, Golubeva M, Greifenhagen R, Guber F, Gumberidze M, Harabasz S, Heinz T, Hennino T, Höhne C, Holzmann R, Ierusalimov A, Ivashkin A, Kämpfer B, Kardan B, Koenig I, Koenig W, Kolb BW, Korcyl G, Kornakov G, Kornas F, Kotte R, Kuboś J, Kugler A, Kunz T, Kurepin A, Kurilkin A, Kurilkin P, Ladygin V, Lalik R, Lapidus K, Lebedev A, Linev S, Lopes L, Lorenz M, Mahmoud T, Maier L, Malige A, Markert J, Maurus S, Metag V, Michel J, Mihaylov DM, Mikhaylov V, Morozov S, Müntz C, Münzer R, Naumann L, Nowakowski K, Parpottas Y, Pechenov V, Pechenova O, Petukhov O, Pietraszko J, Prozorov AP, Przygoda W, Ramstein B, Rathod N, Reshetin A, Rodriguez-Ramos P, Rost A, Sadovsky A, Salabura P, Scheib T, Schmidt-Sommerfeld K, Schuldes H, Schwab E, Scozzi F, Seck F, Sellheim P, Siebenson J, Silva L, Smyrski J, Spataro S, Spies S, Ströbele H, Stroth J, Strzempek P, Sturm C, Svoboda O, Szala M, Tlusty P, Traxler M, Tsertos H, Ungethüm C, Vázquez Doce O, Wagner V, Wendisch C, Wiebusch MG, Wirth J, Wójcik D, Zanevsky Y, Zumbruch P, Curceanu C, Piscicchia K, Scordo A. Strong Absorption of Hadrons with Hidden and Open Strangeness in Nuclear Matter. PHYSICAL REVIEW LETTERS 2019; 123:022002. [PMID: 31386541 DOI: 10.1103/physrevlett.123.022002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 04/29/2019] [Indexed: 06/10/2023]
Abstract
We present the first observation of K^{-} and ϕ absorption within nuclear matter by means of π^{-}-induced reactions on C and W targets at an incident beam momentum of 1.7 GeV/c studied with HADES at SIS18/GSI. The double ratio (K^{-}/K^{+})_{W}/(K^{-}/K^{+})_{C} is found to be 0.319±0.009(stat)_{-0.012}^{+0.014}(syst) indicating a larger absorption of K^{-} in heavier targets as compared to lighter ones. The measured ϕ/K^{-} ratios in π^{-}+C and π^{-}+W reactions within the HADES acceptance are found to be equal to 0.55±0.04(stat)_{-0.07}^{+0.06}(syst) and to 0.63±0.06(stat)_{-0.11}^{+0.11}(syst), respectively. The similar ratios measured in the two different reactions demonstrate for the first time experimentally that the dynamics of the ϕ meson in nuclear medium is strongly coupled to the K^{-} dynamics. The large difference in the ϕ production off C and W nuclei is discussed in terms of a strong ϕN in-medium coupling. These results are relevant for the description of heavy-ion collisions and the structure of neutron stars.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - C Curceanu
- INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
| | - K Piscicchia
- INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
- CENTRO FERMI - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi", 00184 Rome, Italy
| | - A Scordo
- INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
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Abstract
This article presents the kaonic atom studies performed at the INFN National Laboratory of Frascati (Laboratori Nazionali di Frascati dell’INFN, LNF-INFN) since the opening of this field of research at the DA Φ NE collider in early 2000. Significant achievements have been obtained by the DA Φ NE Exotic Atom Research (DEAR) and Silicon Drift Detector for Hadronic Atom Research by Timing Applications (SIDDHARTA) experiments on kaonic hydrogen, which have required the development of novel X-ray detectors. The 2019 installation of the new SIDDHARTA-2 experiment to measure kaonic deuterium for the first time has been made possible by further technological advances in X-ray detection.
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Energy Response of Silicon Drift Detectors for Kaonic Atom Precision Measurements. CONDENSED MATTER 2019. [DOI: 10.3390/condmat4010031] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Novel, large-area silicon drift detectors (SDDs) have been developed to perform precision measurements of kaonic atom X-ray spectroscopy, for the study the K ¯ N strong interaction in the low-energy regime. These devices have special geometries, field configurations and read-out electronics, resulting in excellent performances in terms of linearity, stability and energy resolution. In this work the SDDs energy response in the energy region between 4000 eV and 12,000 eV is reported, revealing a stable linear response within 1 eV and good energy resolution.
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Marton J, Amirkhan A, Baniahmad A, Bazzi M, Bellotti G, Berucci C, Bosnar D, Bragadireanu M, Cargnelli M, Curceanu C, Dawood Butt A, Del Grande R, Fabbietti L, Fiorini C, Ghio F, Guaraldo C, Iliescu M, Iwasaki M, Levi Sandri P, Miliucci M, Moskal P, Niedźwiecki S, Okada S, Pietreanu D, Piscicchia K, Shi H, Silarski M, Sirghi D, Sirghi F, Skurzok M, Spallone A, Tatsuno H, Vazquez Doce O, Widmann E, Zmeskal J. Spectroscopy of kaonic atoms at DAFNE and J-PARC. EPJ WEB OF CONFERENCES 2019. [DOI: 10.1051/epjconf/201919903004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The interaction of antikaons (K−) with nucleons and nuclei in the low-energy regime represents a very active research field in hadron physics. A unique and rather direct experimental access to the antikaon-nucleon scattering lengths is provided by precision X-ray spectroscopy of transitions in low-lying states in the lightest kaonic atoms (i.e. kaonic hydrogen and deuterium). In the SIDDHARTA experiment at the electron-positron collider DAFNE of LNFINFN we measured the most precise values of the strong interaction observables in conic hydrogen. The strong interaction on the 1s ground state of the electromagnetically bound K-p atom causes an energy shift and broadening of the 1s state. SIDDHARTA will extend the spectroscopy to kaonic deuterium to get access to the antikaon-neutron interaction and thus the isospin dependent scattering lengths. At J-PARC a kaon beam is used in a complementary experiment with a different setup for spectroscopy of kaonic deuterium atoms. The talk will give an overview of the of the upcoming experiments SIDDHARTA and the complementary experiment at J-PARC.Furthermore, the implications of the experiments for the theory of low-energy strong interaction with strangeness will be discussed.
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Scordo A, Amirkhani A, Bazzi M, Bellotti G, Berucci C, Bosnar D, Bragadireanu A, Cargnelli M, Curceanu C, Dawood Butt A, Del Grande R, Fabbietti L, Fiorini C, Ghio F, Guaraldo C, Hayano R, Iliescu M, Iwasaki M, Levi Sandri P, Marton J, Miliucci M, Moskal P, Pietreanu D, Piscicchia K, Shi H, Silarski M, Sirghi D, Sirghi F, Skurzok M, Spallone A, Tatsuno H, Vazquez Doce O, Widmann E, Zmeskal J. The kaonic atoms research program at DAΦNE: from SIDDHARTA to SIDDHARTA-2. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201818101004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The interaction of antikaons with nucleons and nuclei in the low-energy regime represents an active research field in hadron physics with still many important open questions. The investigation of light kaonic atoms, in which one electron is replaced by a negatively charged kaon, is a unique tool to provide precise information on this interaction; the energy shift and the broadening of the low-lying states of such atoms, induced by the kaon-nucleus hadronic interaction, can be determined with high precision from the atomic X-ray spectroscopy, and this experimental method provides unique information to understand the low energy kaon-nucleus interaction at the production threshold. The lightest atomic systems, like the kaonic hydrogen and the kaonic deuterium deliver, in a model-independent way, the isospin-dependent kaon-nucleon scattering lengths. The most precise kaonic hydrogen measurement to-date, together with an exploratory measurement of kaonic deuterium, were carried out in 2009 by the SIDDHARTA collaboration at the DAΦNE electron-positron collider of LNF-INFN, combining the excellent quality kaon beam delivered by the collider with new experimental techniques, as fast and very precise X-ray detectors, like the Silicon Drift Detectors. The SIDDHARTA results triggered new theoretical work, which achieved major progress in the understanding of the low-energy strong interaction with strangeness reflected by the antikaon-nucleon scattering lengths calculated with the antikaon-proton amplitudes constrained by the SIDDHARTA data. The most important open question is the experimental determination of the hadronic energy shift and width of kaonic deuterium; presently, a major upgrade of the setup, SIDDHARTA-2, is being realized to reach this goal. In this paper, the results obtained in 2009 and the proposed SIDDHARTA-2 upgrades are presented.
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Tatsuno H, Bazzi M, Beer G, Bellotti G, Berucci C, Bragadireanu A, Bosnar D, Cargnelli M, Curceanu C, Butt A, d’Uffizi A, Fiorini C, Ghio F, Guaraldo C, Hayano R, Iliescu M, Ishiwatari T, Iwasaki M, Levi Sandri P, Marton J, Okada S, Pietreanu D, Piscicchia K, Romero Vidal A, Sbardella E, Scordo A, Shi H, Sirghi D, Sirghi F, Vazquez Doce O, Widmann E, Zmeskal J. Future projects of light kaonic atom X-ray spectroscopy. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201613001018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Brambilla N, Eidelman S, Foka P, Gardner S, Kronfeld AS, Alford MG, Alkofer R, Butenschoen M, Cohen TD, Erdmenger J, Fabbietti L, Faber M, Goity JL, Ketzer B, Lin HW, Llanes-Estrada FJ, Meyer HB, Pakhlov P, Pallante E, Polikarpov MI, Sazdjian H, Schmitt A, Snow WM, Vairo A, Vogt R, Vuorinen A, Wittig H, Arnold P, Christakoglou P, Di Nezza P, Fodor Z, Garcia i Tormo X, Höllwieser R, Janik MA, Kalweit A, Keane D, Kiritsis E, Mischke A, Mizuk R, Odyniec G, Papadodimas K, Pich A, Pittau R, Qiu JW, Ricciardi G, Salgado CA, Schwenzer K, Stefanis NG, von Hippel GM, Zakharov VI. QCD and strongly coupled gauge theories: challenges and perspectives. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2014; 74:2981. [PMID: 25972760 PMCID: PMC4413533 DOI: 10.1140/epjc/s10052-014-2981-5] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Accepted: 07/05/2014] [Indexed: 05/17/2023]
Abstract
We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.
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Affiliation(s)
- N. Brambilla
- Physik Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - S. Eidelman
- Budker Institute of Nuclear Physics, SB RAS, Novosibirsk , 630090 Russia
- Novosibirsk State University, Novosibirsk , 630090 Russia
| | - P. Foka
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - S. Gardner
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055 USA
| | - A. S. Kronfeld
- Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510-5011 USA
| | - M. G. Alford
- Department of Physics, Washington University, St Louis, MO 63130 USA
| | | | - M. Butenschoen
- Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Wien, Austria
| | - T. D. Cohen
- Maryland Center for Fundamental Physics and Department of Physics, University of Maryland, College Park, MD 20742-4111 USA
| | - J. Erdmenger
- Max-Planck-Institute for Physics, Föhringer Ring 6, 80805 Munich, Germany
| | - L. Fabbietti
- Excellence Cluster “Origin and Structure of the Universe”, Technische Universität München, 85748 Garching, Germany
| | - M. Faber
- Atominstitut, Technische Universität Wien, 1040 Vienna, Austria
| | - J. L. Goity
- Hampton University, Hampton, VA 23668 USA
- Jefferson Laboratory, Newport News, VA 23606 USA
| | - B. Ketzer
- Physik Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
- Present Address: Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany
| | - H. W. Lin
- Department of Physics, University of Washington, Seattle, WA 98195-1560 USA
| | - F. J. Llanes-Estrada
- Department Fisica Teorica I, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - H. B. Meyer
- PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - P. Pakhlov
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia
| | - E. Pallante
- Centre for Theoretical Physics, University of Groningen, 9747 AG Groningen, The Netherlands
| | - M. I. Polikarpov
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia
| | - H. Sazdjian
- Institut de Physique Nucléaire CNRS/IN2P3, Université Paris-Sud, 91405 Orsay, France
| | - A. Schmitt
- Institut für Theoretische Physik, Technische Universität Wien, 1040 Vienna, Austria
| | - W. M. Snow
- Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408 USA
| | - A. Vairo
- Physik Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - R. Vogt
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94551 USA
- Physics Department, University of California, Davis, CA 95616 USA
| | - A. Vuorinen
- Department of Physics and Helsinki Institute of Physics, University of Helsinki, Helsinki, P.O. Box 64, 00014 Finland
| | - H. Wittig
- PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - P. Arnold
- Department of Physics, University of Virginia, 382 McCormick Rd., P.O. Box 400714, Charlottesville, VA 22904-4714 USA
| | | | - P. Di Nezza
- Istituto Nazionale di Fisica Nucleare (INFN), Via E. Fermi 40, 00044 Frascati, Italy
| | - Z. Fodor
- Wuppertal University, 42119 Wuppertal, Germany
- Eötvös University, 1117 Budapest, Hungary
- Forschungszentrum Jülich, 52425 Jülich, Germany
| | - X. Garcia i Tormo
- Albert Einstein Center for Fundamental Physics, Institut für Theoretische Physik, Universität Bern, Sidlerstraße 5, 3012 Bern, Switzerland
| | - R. Höllwieser
- Atominstitut, Technische Universität Wien, 1040 Vienna, Austria
| | - M. A. Janik
- Faculty of Physics, Warsaw University of Technology, 00-662 Warsaw, Poland
| | - A. Kalweit
- European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - D. Keane
- Department of Physics, Kent State University, Kent, OH 44242 USA
| | - E. Kiritsis
- Crete Center for Theoretical Physics, Department of Physics, University of Crete, 71003 Heraklion, Greece
- Laboratoire APC, Université Paris Diderot, Paris Cedex 13, Sorbonne Paris-Cité , 75205 France
- Theory Group, Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - A. Mischke
- Faculty of Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - R. Mizuk
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Physical Engineering Institute, Moscow, 115409 Russia
| | - G. Odyniec
- Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA 94720 USA
| | - K. Papadodimas
- Centre for Theoretical Physics, University of Groningen, 9747 AG Groningen, The Netherlands
| | - A. Pich
- IFIC, Universitat de València, CSIC, Apt. Correus 22085, 46071 València, Spain
| | - R. Pittau
- Departamento de Fisica Teorica y del Cosmos and CAFPE, Campus Fuentenueva s. n., Universidad de Granada, 18071 Granada, Spain
| | - J.-W. Qiu
- Physics Department, Brookhaven National Laboratory, Upton, NY 11973 USA
- C. N. Yang Institute for Theoretical Physics and Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794 USA
| | - G. Ricciardi
- Dipartimento di Fisica, Università degli Studi di Napoli Federico II, 80126 Napoli, Italy
- INFN, Sezione di Napoli, 80126 Napoli, Italy
| | - C. A. Salgado
- Departamento de Fisica de Particulas y IGFAE, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
| | - K. Schwenzer
- Department of Physics, Washington University, St Louis, MO 63130 USA
| | - N. G. Stefanis
- Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - G. M. von Hippel
- PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - V. I. Zakharov
- Max-Planck-Institute for Physics, Föhringer Ring 6, 80805 Munich, Germany
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia
- School of Biomedicine, Far Eastern Federal University, Sukhanova str 8, Vladivostok, 690950 Russia
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10
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Ishiwatari T, Bazzi M, Beer G, Berucci C, Bombelli L, Bragadireanu A, Cargnelli M, Curceanu C, d’Uffizi A, Fiorini C, Ghio F, Guaraldo C, Hayano R, Iliescu M, Iwasaki M, Kienle P, Levi Sandri P, Longoni A, Marton J, Okada S, Pietreanu D, Ponta T, Quaglia R, Romero Vidal A, Sbardella E, Scordo A, Shi H, Sirghi D, Sirghi F, Tatsuno H, Tudorache A, Tudorache V, Vazquez Doce O, Wünschek B, Widmann E, Zmeskal J. New precision era of experiments on strong interaction with strangeness at DAFNE/LNF-INFN. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146605016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Curceanu C, Bazzi M, Beer G, Berucci C, Bosnar D, Bragadireanu A, Cargnelli M, Clozza A, D’Uffizi A, Fabbietti L, Fiorini C, Ghio F, Guaraldo C, Hayano R, Iliescu M, Ishiwatari T, Iwasaki M, Levi Sandri P, Marton J, Okada S, Pietreanu D, Piscicchia K, Poli Lener M, Ponta T, Quaglia R, Romero Vidal A, Sbardella E, Scordo A, Shi H, Sirghi D, Sirghi F, Tatsuno H, Tucaković I, Vazquez Doce O, Widmann E, Zmeskal J. Unveiling the strangeness secrets: low-energy kaon-nucleon/nuclei interactions studies at DAΦNE. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146609004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Ishiwatari T, Bazzi M, Beer G, Bombelli L, Bragadireanu AM, Cargnelli M, Curceanu Petrascu C, Dʼuffizi A, Fiorini C, Frizzi T, Ghio F, Guaraldo C, Hayano RS, Iliescu M, Iwasaki M, Kienle P, Levi Sandri P, Longoni A, Marton J, Okada S, Pietreanu D, Ponta T, Rizzo A, Romero Vidal A, Sbardella E, Scordo A, Shi H, Sirghi DL, Sirghi F, Tatsuno H, Tudorache A, Tudorache V, Vazquez Doce O, Widmann E, Wünschek B, Zmeskal J. Strong-interaction shifts and widths of kaonic helium isotopes. NUCLEAR PHYSICS. A 2013; 914:305-309. [PMID: 24068854 PMCID: PMC3778894 DOI: 10.1016/j.nuclphysa.2012.12.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 11/27/2012] [Accepted: 12/07/2012] [Indexed: 06/02/2023]
Abstract
The kaonic 3He and 4He [Formula: see text] transitions in gaseous targets were observed by the SIDDHARTA experiment. The X-ray energies of these transitions were measured with large-area silicon-drift detectors using the timing information of the [Formula: see text] pairs produced by the DAΦNE [Formula: see text] collider. The strong-interaction shifts and widths both of the kaonic 3He and 4He 2p states were determined, which are much smaller than the results obtained by the previous experiments. The "kaonic helium puzzle" (a discrepancy between theory and experiment) was now resolved.
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13
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Bazzi M, Beer G, Berucci C, Bombelli L, Bragadireanu A, Cargnelli M, Curceanu (Petrascu) C, dʼUffizi A, Fiorini C, Frizzi T, Ghio F, Guaraldo C, Hayano R, Iliescu M, Ishiwatari T, Iwasaki M, Kienle P, Levi Sandri P, Longoni A, Marton J, Okada S, Pietreanu D, Ponta T, Romero Vidal A, Sbardella E, Scordo A, Shi H, Sirghi D, Sirghi F, Tatsuno H, Tudorache A, Tudorache V, Vazquez Doce O, Widmann E, Zmeskal J. Preliminary study of kaonic deuterium X-rays by the SIDDHARTA experiment at DAΦNE. NUCLEAR PHYSICS. A 2013; 907:69-77. [PMID: 23805024 PMCID: PMC3688359 DOI: 10.1016/j.nuclphysa.2013.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 02/27/2013] [Accepted: 03/01/2013] [Indexed: 05/28/2023]
Abstract
The study of the [Formula: see text] system at very low energies plays a key role for the understanding of the strong interaction between hadrons in the strangeness sector. At the DAΦNE electron-positron collider of Laboratori Nazionali di Frascati we studied kaonic atoms with [Formula: see text] and [Formula: see text], taking advantage of the low-energy charged kaons from Φ-mesons decaying nearly at rest. The SIDDHARTA experiment used X-ray spectroscopy of the kaonic atoms to determine the transition yields and the strong interaction induced shift and width of the lowest experimentally accessible level (1s for H and D and 2p for He). Shift and width are connected to the real and imaginary part of the scattering length. To disentangle the isospin dependent scattering lengths of the antikaon-nucleon interaction, measurements of [Formula: see text] and of [Formula: see text] are needed. We report here on an exploratory deuterium measurement, from which a limit for the yield of the K-series transitions was derived: [Formula: see text] and [Formula: see text] (CL 90%). Also, the upcoming SIDDHARTA-2 kaonic deuterium experiment is introduced.
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Affiliation(s)
- M. Bazzi
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - G. Beer
- Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria BC V8W3P6, Canada
| | - C. Berucci
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
- Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
| | - L. Bombelli
- Politecnico di Milano, Dipartimento di Elettronica e Informazione, Piazza L. da Vinci 32, I-20133 Milano, Italy
| | - A.M. Bragadireanu
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
- IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
| | - M. Cargnelli
- Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
| | - C. Curceanu (Petrascu)
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - A. dʼUffizi
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - C. Fiorini
- Politecnico di Milano, Dipartimento di Elettronica e Informazione, Piazza L. da Vinci 32, I-20133 Milano, Italy
| | - T. Frizzi
- Politecnico di Milano, Dipartimento di Elettronica e Informazione, Piazza L. da Vinci 32, I-20133 Milano, Italy
| | - F. Ghio
- INFN Sezione di Roma I and Instituto Superiore di Sanita, I-00161 Roma, Italy
| | - C. Guaraldo
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - R. Hayano
- University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan
| | - M. Iliescu
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - T. Ishiwatari
- Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
| | - M. Iwasaki
- RIKEN, Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - P. Kienle
- Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
- Excellence Cluster Universe, Technische Universität München, Boltzmannstraße 2, D-85748 Garching, Germany
| | - P. Levi Sandri
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - A. Longoni
- Politecnico di Milano, Dipartimento di Elettronica e Informazione, Piazza L. da Vinci 32, I-20133 Milano, Italy
| | - J. Marton
- Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
| | - S. Okada
- RIKEN, Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D. Pietreanu
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
- IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
| | - T. Ponta
- IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
| | - A. Romero Vidal
- Universidade de Santiago de Compostela, Casas Reais 8, 15782 Santiago de Compostela, Spain
| | - E. Sbardella
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - A. Scordo
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - H. Shi
- University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan
| | - D.L. Sirghi
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
- IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
| | - F. Sirghi
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
- IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
| | - H. Tatsuno
- INFN, Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati (Roma), Italy
| | - A. Tudorache
- IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
| | - V. Tudorache
- IFIN-HH, Institutul National pentru Fizica si Inginerie Nucleara Horia Hulubei, Reactorului 30, Magurele, Romania
| | - O. Vazquez Doce
- Excellence Cluster Universe, Technische Universität München, Boltzmannstraße 2, D-85748 Garching, Germany
| | - E. Widmann
- Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
| | - J. Zmeskal
- Stefan-Meyer-Institut für subatomare Physik, Boltzmanngasse 3, 1090 Wien, Austria
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14
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Bazzi M, Beer G, Bombelli L, Bragadireanu A, Cargnelli M, Curceanu (Petrascu) C, dʼUffizi A, Fiorini C, Frizzi T, Ghio F, Guaraldo C, Hayano R, Iliescu M, Ishiwatari T, Iwasaki M, Kienle P, Levi Sandri P, Longoni A, Marton J, Okada S, Pietreanu D, Ponta T, Rizzo A, Romero Vidal A, Sbardella E, Scordo A, Shi H, Sirghi D, Sirghi F, Tatsuno H, Tudorache A, Tudorache V, Vazquez Doce O, Wünschek B, Widmann E, Zmeskal J. Measurements of the strong-interaction widths of the kaonic (3)He and (4)He 2p levels. PHYSICS LETTERS. [PART B] 2012; 714:40-43. [PMID: 22876000 PMCID: PMC3405488 DOI: 10.1016/j.physletb.2012.06.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Revised: 06/06/2012] [Accepted: 06/26/2012] [Indexed: 06/01/2023]
Abstract
The kaonic (3)He and (4)He X-rays emitted in the [Formula: see text] transitions were measured in the SIDDHARTA experiment. The widths of the kaonic (3)He and (4)He 2p states were determined to be [Formula: see text], and [Formula: see text], respectively. Both results are consistent with the theoretical predictions. The width of kaonic (4)He is much smaller than the value of [Formula: see text] determined by the experiments performed in the 70's and 80's, while the width of kaonic (3)He was determined for the first time.
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Affiliation(s)
| | - M. Bazzi
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | - G. Beer
- Dep. of Phys. and Astro., Univ. of Victoria, Victoria B.C., Canada
| | - L. Bombelli
- Politecnico di Milano, Sez. di Elettronica, Milano, Italy
| | - A.M. Bragadireanu
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
- IFIN-HH, Magurele, Bucharest, Romania
| | - M. Cargnelli
- Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria
| | | | - A. dʼUffizi
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | - C. Fiorini
- Politecnico di Milano, Sez. di Elettronica, Milano, Italy
| | - T. Frizzi
- Politecnico di Milano, Sez. di Elettronica, Milano, Italy
| | - F. Ghio
- INFN Sez. di Roma I and Inst. Superiore di Sanita, Roma, Italy
| | - C. Guaraldo
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | | | - M. Iliescu
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
- IFIN-HH, Magurele, Bucharest, Romania
| | - T. Ishiwatari
- Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria
| | - M. Iwasaki
- RIKEN, The Inst. of Phys. and Chem. Research, Saitama, Japan
| | - P. Kienle
- Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria
- Excellence Cluster Universe, Tech. Univ. München, Garching, Germany
| | - P. Levi Sandri
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | - A. Longoni
- Politecnico di Milano, Sez. di Elettronica, Milano, Italy
| | - J. Marton
- Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria
| | - S. Okada
- RIKEN, The Inst. of Phys. and Chem. Research, Saitama, Japan
| | - D. Pietreanu
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
- IFIN-HH, Magurele, Bucharest, Romania
| | - T. Ponta
- IFIN-HH, Magurele, Bucharest, Romania
| | - A. Rizzo
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | - A. Romero Vidal
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | - E. Sbardella
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | - A. Scordo
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | - H. Shi
- Univ. of Tokyo, Tokyo, Japan
| | - D.L. Sirghi
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
- IFIN-HH, Magurele, Bucharest, Romania
| | - F. Sirghi
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
- IFIN-HH, Magurele, Bucharest, Romania
| | - H. Tatsuno
- INFN, Laboratori Nazionali di Frascati, Frascati (Roma), Italy
| | | | | | - O. Vazquez Doce
- Excellence Cluster Universe, Tech. Univ. München, Garching, Germany
| | - B. Wünschek
- Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria
| | - E. Widmann
- Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria
| | - J. Zmeskal
- Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria
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