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Ripani M, Burkert VD, Mokeev V, Battaglieri M, De Vita R, Golovach E, Taiuti M, Adams G, Anciant E, Anghinolfi M, Asavapibhop B, Audit G, Auger T, Avakian H, Bagdasaryan H, Ball JP, Barrow S, Beard K, Bektasoglu M, Bellis M, Berman BL, Bianchi N, Biselli AS, Boiarinov S, Bonner BE, Bouchigny S, Bradford R, Branford D, Briscoe WJ, Brooks WK, Calarco JR, Carman DS, Carnahan B, Cazes A, Cetina C, Ciciani L, Cole PL, Coleman A, Cords D, Corvisiero P, Crabb D, Crannell H, Cummings JP, De Sanctis E, Degtyarenko PV, Denizli H, Dennis L, Dharmawardane KV, Djalali C, Dodge GE, Doughty D, Dragovitsch P, Dugger M, Dytman S, Eckhause M, Egiyan H, Egiyan KS, Elouadrhiri L, Empl A, Fatemi R, Fedotov G, Feldman G, Feuerbach RJ, Ficenec J, Forest TA, Funsten H, Gaff SJ, Gai M, Garçon M, Gavalian G, Gilad S, Gilfoyle GP, Giovanetti KL, Girard P, Griffioen K, Guidal M, Guillo M, Guo L, Gyurjyan V, Hadjidakis C, Hardie J, Heddle D, Heimberg P, Hersman FW, Hicks K, Hicks RS, Holtrop M, Hu J, Hyde-Wright CE, Ishkhanov B, Ito MM, Jenkins D, Joo K, Kelley JH, Kellie JD, Khandaker M, Kim KY, Kim K, Kim W, Klein A, Klein FJ, Klimenko AV, Klusman M, Kossov M, Kramer LH, Kuang Y, Kuhn SE, Kuhn J, Lachniet J, Laget JM, Lawrence D, Li J, Livingston K, Longhi A, Lukashin K, Manak JJ, Marchand C, McAleer S, McCarthy J, McNabb JWC, Mecking BA, Mestayer MD, Meyer CA, Mikhailov K, Minehart R, Mirazita M, Miskimen R, Morand L, Morrow SA, Mozer MU, Muccifora V, Mueller J, Murphy LY, Mutchler GS, Napolitano J, Nasseripour R, Nelson SO, Niccolai S, Niculescu G, Niculescu I, Niczyporuk BB, Niyazov RA, Nozar M, O'Rielly GV, Opper AK, Osipenko M, Park K, Pasyuk E, Peterson G, Philips SA, Pivnyuk N, Pocanic D, Pogorelko O, Polli E, Pozdniakov S, Preedom BM, Price JW, Prok Y, Protopopescu D, Qin LM, Quinn B, Raue BA, Riccardi G, Ricco G, Ritchie BG, Ronchetti F, Rossi P, Rowntree D, Rubin PD, Sabatié F, Sabourov K, Salgado C, Santoro JP, Sapunenko V, Schumacher RA, Serov VS, Shafi A, Sharabian YG, Shaw J, Simionatto S, Skabelin AV, Smith ES, Smith LC, Sober DI, Spraker M, Stavinsky A, Stepanyan S, Stoler P, Strakovsky II, Taylor S, Tedeschi DJ, Thoma U, Thompson R, Todor L, Ungaro M, Vineyard MF, Vlassov AV, Wang K, Weinstein LB, Weller H, Weygand DP, Whisnant CS, Wolin E, Wood MH, Yegneswaran A, Yun J, Zhang B, Zhao J, Zhou Z. Measurement of ep-->e' ppi+ pi- and baryon resonance analysis. PHYSICAL REVIEW LETTERS 2003; 91:022002. [PMID: 12906472 DOI: 10.1103/physrevlett.91.022002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2002] [Indexed: 05/24/2023]
Abstract
The cross section for the reaction ep-->e(')ppi(+)pi(-) was measured in the resonance region for 1.4<W<2.1 GeV and 0.5<Q2<1.5 GeV(2)/c(2) using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N(*) and Delta states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P13(1720) resonance or by introducing a new baryon state, not reported in published analyses.
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Affiliation(s)
- M Ripani
- INFN, Sezione di Genova, 16146 Genova, Italy
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De Vita R, Anghinolfi M, Burkert VD, Dodge GE, Minehart R, Taiuti M, Weller H, Adams G, Amaryan MJ, Anciant E, Armstrong DS, Asavapibhop B, Asryan G, Audit G, Auger T, Avakian H, Bagdasaryan H, Ball JP, Barrow S, Battaglieri M, Beard K, Bektasoglu M, Bianchi N, Biselli AS, Boiarinov S, Bonner BE, Bosted P, Bouchigny S, Branford D, Brooks WK, Bueltmann S, Calarco JR, Capitani GP, Carman DS, Carnahan B, Cazes A, Ciciani L, Cole PL, Coleman A, Connelly J, Cords D, Corvisiero P, Crabb D, Crannell H, Cummings JP, De Sanctis E, Degtyarenko PV, Demirchyan R, Denizli H, Dennis L, Dharmawardane KV, Dhuga KS, Djalali C, Doughty D, Dragovitsch P, Dugger M, Dytman S, Eckhause M, Egiyan H, Egiyan KS, Elouadrhiri L, Empl A, Farhi L, Fatemi R, Feuerbach RJ, Ficenec J, Forest TA, Frolov V, Funsten H, Gaff SJ, Gai M, Garçon M, Gavalian G, Gilad S, Gilfoyle GP, Giovanetti KL, Girard P, Golovatch E, Griffioen K, Guidal M, Guillo M, Gyurjyan V, Hadjidakis C, Hancock D, Hardie J, Heddle D, Heimberg P, Hersman FW, Hicks K, Hicks RS, Holtrop M, Hu J, Hyde-Wright CE, Ishkanov BS, Ito MM, Jenkins D, Joo K, Kelley JH, Kellie JD, Khandaker M, Kim KY, Kim K, Kim W, Klein A, Klein FJ, Klusman M, Kossov M, Kramer LH, Kuang Y, Kuhn SE, Lachniet J, Laget JM, Lawrence D, Li J, Livingston K, Longhi A, Loukachine K, Lucas M, Major W, Manak JJ, Marchand C, McAleer S, McCarthy J, McNabb JWC, Mecking BA, Mestayer MD, Meyer CA, Mikhailov K, Mirazita M, Miskimen R, Mokeev V, Muccifora V, Mueller J, Mutchler GS, Napolitano J, Nelson SO, Niculescu G, Niculescu I, Niczyporuk BB, Niyazov RA, Opper AK, O'Rielly GV, Osipenko M, Park K, Pasyuk E, Peterson G, Philips SA, Pivnyuk N, Pocanic D, Pogorelko O, Polli E, Pozdniakov S, Preedom BM, Price JW, Prok Y, Protopopescu D, Qin LM, Raue BA, Reolon AR, Riccardi G, Ricco G, Ripani M, Ritchie BG, Rock S, Ronchetti F, Rossi P, Rowntree D, Rubin PD, Sabatié F, Sabourov K, Salgado C, Sapunenko V, Sargsyan M, Schumacher RA, Serov VS, Shafi A, Sharabian YG, Shaw J, Skabelin AV, Smith ES, Smith T, Smith LC, Sober DI, Sorrell L, Spraker M, Stavinsky A, Stepanyan S, Stoler P, Strakovsky II, Taylor S, Tedeschi DJ, Thompson R, Todor L, Ungaro M, Vineyard MF, Vlassov AV, Wang K, Weinstein LB, Weisberg A, Weygand DP, Whisnant CS, Wolin E, Yegneswaran A, Yun J, Zhang B, Zhao J, Zhou Z. First measurement of the double spin asymmetry in (-->)e(-->)p-->e(prime)pi(+)n in the resonance region. PHYSICAL REVIEW LETTERS 2002; 88:082001. [PMID: 11863951 DOI: 10.1103/physrevlett.88.082001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2001] [Indexed: 05/23/2023]
Abstract
The double spin asymmetry in the (-->)e(-->)p --> e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.
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Affiliation(s)
- R De Vita
- Istituto Nazionale di Fisica Nucleare, Sezione di Genova, and Dipartimento di Fisica dell'Università, 16146 Genova, Italy
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Thompson R, Dytman S, Kim KY, Mueller J, Adams GS, Amaryan MJ, Anciant E, Anghinolfi M, Asavapibhop B, Auger T, Audit G, Avakian H, Barrow S, Battaglieri M, Beard K, Bektasoglu M, Bertozzi W, Bianchi N, Biselli A, Boiarinov S, Bonner BE, Briscoe WJ, Brooks W, Burkert VD, Calarco JR, Capitani G, Carman DS, Carnahan B, Cole PL, Coleman A, Connelly J, Cords D, Corvisiero P, Crabb D, Crannell H, Cummings J, Day D, Degtyarenko PV, Demirchyan RA, Dennis LC, Deppman A, De Sanctis E, De Vita R, Dhuga KS, Djalali C, Dodge GE, Doughty D, Dragovitsch P, Dugger M, Eckhause M, Efremenko YV, Egiyan H, Egiyan KS, Elouadrhiri L, Farhi L, Feuerbach RJ, Ficenec J, Fissum K, Freyberger A, Funsten H, Gai M, Gavrilov VB, Gilfoyle GP, Giovanetti K, Gilad S, Girard P, Griffioen KA, Guidal M, Guillo M, Gyurjyan V, Hancock D, Hardie J, Heddle D, Heisenberg J, Hersman FW, Hicks K, Hicks RS, Holtrop M, Hyde-Wright CE, Ito MM, Jenkins D, Joo K, Kane J, Khandaker M, Kim W, Klein A, Klein FJ, Klusman M, Kossov M, Kuhn SE, Kuang Y, Laget JM, Lawrence D, Leskin GA, Longhi A, Loukachine K, Lucas M, Magahiz R, Major RW, Manak JJ, Marchand C, Matthews SK, McAleer S, McCarthy J, McNabb JW, Mecking BA, Mestayer MD, Meyer CA, Minehart R, Mirazita M, Miskimen R, Muccifora V, Mutchler GS, Napolitano J, Niyazov RA, Ohandjanyan MS, O'Brien JT, Opper A, Patois Y, Peterson GA, Philips S, Pivnyuk N, Pocanic D, Pogorelko O, Polli E, Preedom BM, Price JW, Qin LM, Raue BA, Reolon AR, Riccardi G, Ricco G, Ripani M, Ritchie BG, Ronchetti F, Rossi P, Roudot F, Rowntree D, Rubin PD, Salgado CW, Sanzone M, Sapunenko V, Sarty A, Sargsyan M, Schumacher RA, Shafi A, Sharabian YG, Shaw J, Shuvalov SM, Skabelin A, Smith T, Smith C, Smith ES, Sober DI, Spraker M, Stepanyan S, Stoler P, Taiuti M, Taylor S, Tedeschi D, Tung TY, Vineyard MF, Vlassov A, Weller H, Weinstein LB, Welsh R, Weygand DP, Whisnant S, Witkowski M, Wolin E, Yegneswaran A, Yun J, Zhou Z, Zhao J. The ep -->e'p eta reaction at and above the S11(1535) baryon resonance. PHYSICAL REVIEW LETTERS 2001; 86:1702-1706. [PMID: 11290228 DOI: 10.1103/physrevlett.86.1702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2000] [Indexed: 05/23/2023]
Abstract
New cross sections for the reaction e p-->e p eta are reported for total center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q2 = 0.25--1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.
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Affiliation(s)
- R Thompson
- Department of Physics and Astronomy, University of Pittsburgh, Pennsylvania 15260, USA
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Sato T, Lee T. Meson-exchange model for pi N scattering and gamma N--> pi N reaction. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1996; 54:2660-2684. [PMID: 9971622 DOI: 10.1103/physrevc.54.2660] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li Z, Ma WH, Zhang L. Kaon production via gamma N-->K Sigma in the chiral quark model. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1996; 54:R2171-R2174. [PMID: 9971653 DOI: 10.1103/physrevc.54.r2171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li Z, Dong YB. Effects of the quantity sigma TS on the spin structure functions of nucleons in the resonance region. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1996; 54:4301-4311. [PMID: 10021110 DOI: 10.1103/physrevd.54.4301] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bijker R, Iachello F, Leviatan A. Electromagnetic form factors in a collective model of the nucleon. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1996; 54:1935-1953. [PMID: 9971543 DOI: 10.1103/physrevc.54.1935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Li Z, Workman R. Do we have three S11 resonances in the second resonance region? PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1996; 53:R549-R552. [PMID: 9971037 DOI: 10.1103/physrevc.53.r549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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11
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Li Z. eta photoproduction of nucleons and the structure of the resonance S11(1535) in the quark model. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1995; 52:4961-4970. [PMID: 10019719 DOI: 10.1103/physrevd.52.4961] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Szczepaniak A, Ji CR, Cotanch SR. Nucleon structure in a relativistic quark model. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1995; 52:2738-2755. [PMID: 9970805 DOI: 10.1103/physrevc.52.2738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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13
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Li Z. Kaon photoproduction off nucleons in the chiral quark model. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1995; 52:1648-1661. [PMID: 9970667 DOI: 10.1103/physrevc.52.1648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Benmerrouche M, Mukhopadhyay NC, Zhang JF. Effective Lagrangian approach to the theory of eta photoproduction in the N*(1535) region. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1995; 51:3237-3266. [PMID: 10018799 DOI: 10.1103/physrevd.51.3237] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Capstick S, Keister BD. Baryon current matrix elements in a light-front framework. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1995; 51:3598-3612. [PMID: 10018832 DOI: 10.1103/physrevd.51.3598] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Li Z. Threshold pion photoproduction of nucleons in the chiral quark model. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1994; 50:5639-5646. [PMID: 10018219 DOI: 10.1103/physrevd.50.5639] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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17
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Li Z. Q2 dependence of the spin structure function in the resonance region. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1994; 50:3119-3123. [PMID: 10017945 DOI: 10.1103/physrevd.50.3119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Slaughter MD, Oneda S. Calculation of the Delta +p gamma photon-decay amplitude A1/2 and the E1+/M1+ ratio in single-pion electroproduction: An algebraic approach. Int J Clin Exp Med 1994; 49:323-327. [PMID: 10016770 DOI: 10.1103/physrevd.49.323] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Li Z. Compton scattering and polarizabilities of the nucleon in the quark model. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1993; 48:3070-3080. [PMID: 10016562 DOI: 10.1103/physrevd.48.3070] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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22
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Li Z, Arndt RA, Roper LD, Workman RL. Resonance photodecay amplitudes to 1.8 GeV. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1993; 47:2759-2763. [PMID: 9968751 DOI: 10.1103/physrevc.47.2759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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23
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Li Z. Polarized structure function of the nucleon in the resonance region. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1993; 47:1854-1864. [PMID: 10015768 DOI: 10.1103/physrevd.47.1854] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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24
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Capstick S. Photo- and electroproduction of nonstrange baryon resonances in the relativized quark model. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1992; 46:2864-2881. [PMID: 10015222 DOI: 10.1103/physrevd.46.2864] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Capstick S. Photoproduction amplitudes of P11 and P33 baryon resonances in the quark model. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1992; 46:1965-1972. [PMID: 10015113 DOI: 10.1103/physrevd.46.1965] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Capstick S, Keister BD. Nucleon Compton scattering in the nonrelativistic quark model. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1992; 46:84-100. [PMID: 10014743 DOI: 10.1103/physrevd.46.84] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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27
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Close FE, Li Z. A unified formalism for γγ→meson and ψ-γX with possible tests for hybrid and gluonic hadrons. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01881718] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Li Z. Photoproduction signatures of hybrid baryons: An application of the quark model with gluonic degrees of freedom. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1991; 44:2841-2850. [PMID: 10014173 DOI: 10.1103/physrevd.44.2841] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Benmerrouche M, Mukhopadhyay NC. eta photoproduction from threshold through the S11(1535) resonance. PHYSICAL REVIEW LETTERS 1991; 67:1070-1073. [PMID: 10045068 DOI: 10.1103/physrevlett.67.1070] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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30
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Li ZP, Close FE, Barnes T. Relativistic effects in gamma gamma decays of P-wave positronium and qq-bar systems. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1991; 43:2161-2170. [PMID: 10013600 DOI: 10.1103/physrevd.43.2161] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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31
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Li Z, Close FE. QCD mixing effects in a gauge-invariant quark model for photo- and electroproduction of baryon resonances. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1990; 42:2207-2214. [PMID: 10013074 DOI: 10.1103/physrevd.42.2207] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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