Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5–3.0 GeV

作     者：S. H. Shiu H. Kohri W. C. Chang D. S. Ahn J. K. Ahn J. Y. Chen S. Daté H. Ejiri H. Fujimura M. Fujiwara S. Fukui W. Gohn K. Hicks T. Hotta S. H. Hwang K. Imai T. Ishikawa K. Joo Y. Kato Y. Kon H. S. Lee Y. Maeda T. Mibe M. Miyabe K. Mizutani Y. Morino N. Muramatsu T. Nakano Y. Nakatsugawa M. Niiyama H. Noumi Y. Ohashi T. Ohta M. Oka J. D. Parker C. Rangacharyulu S. Y. Ryu T. Sawada H. Shimizu Y. Sugaya M. Sumihama T. Tsunemi M. Uchida M. Ungaro M. Yosoi 

作者机构：Institute of Physics Academia Sinica Taipei 11529 Taiwan Department of Physics National Central University Taoyuan City 32001 Taiwan Research Center for Nuclear Physics Osaka University Ibaraki Osaka 567-0047 Japan RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan Department of Physics Korea University Seoul 02841 Republic of Korea Light Source Division National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Japan Synchrotron Radiation Research Institute Sayo Hyogo 679-5143 Japan Wakayama Medical College Wakayama 641-8509 Japan National Institutes for Quantum and Radiological Science and Technology Tokai Ibaraki 319-1195 Japan Department of Physics University of Connecticut Storrs Connecticut 06269-3046 USA Department of Physics and Astronomy Ohio University Athens Ohio 45701 USA Korea Research Institute of Standards and Science (KRISS) Daejeon 34113 Republic of Korea Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Research Center for Electron Photon Science Tohoku University Sendai Miyagi 982-0826 Japan Kobayashi-Maskawa Institute Nagoya University Nagoya Aichi 464-8602 Japan Rare Isotope Science Project Institute for Basic Science Daejeon 34047 Korea Proton Therapy Center Fukui Prefectural Hospital Fukui 910-8526 Japan High Energy Accelerator Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Department of Physics Kyoto University Kyoto 606-8502 Japan Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Radiology The University of Tokyo Hospital Tokyo 113-8655 Japan Neutron Science and Technology Center Comprehensive Research Organization for Science and Society (CROSS) Tokai Ibaraki 319-1106 Japan Department of Physics and Engineering Physics University of Saskatchewan Saskatoon SK S7N 5E2 Canada Physics Department University of Michigan Michigan 48109-1040 USA Department of Education Gifu University Gifu 501-1193 Japan Graduate School of Science Kyoto University Kyoto 606-8502 Japan Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan 

出 版 物：《Physical Review C》 (物理学评论C辑：核物理学)

年 卷 期：2018年第97卷第1期

页      面：015208-015208页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：National Science Foundation, NSF, (1714008) National Science Foundation, NSF Japan Society for the Promotion of Science, JSPS, (16K05379) Japan Society for the Promotion of Science, JSPS Ministry of Education, Culture, Sports, Science and Technology, MEXT National Research Foundation of Korea, NRF Ministry of Science and Technology, Taiwan, MOST 

主　　题：Particle production Photonuclear reactions Polarization phenomena 

摘      要：We report the measurement of the γp→K+Λ and γp→K+Σ0 reactions at SPring-8. The differential cross sections and photon-beam asymmetries are measured at forward K+ production angles using linearly polarized tagged-photon beams in the range of Eγ=1.5–3.0 GeV. With increasing photon energy, the cross sections for both γp→K+Λ and γp→K+Σ0 reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at Eγ=1.5–3.0 GeV. The forward peaking in the angular distributions of cross sections, a characteristic feature of t-channel exchange, is observed for the production of Λ in the whole observed energy range. A lack of similar feature for Σ0 production reflects a less dominant role of t-channel contribution in this channel. The photon-beam asymmetries remain positive for both reactions, suggesting the dominance of K* exchange in the t channel. These asymmetries increase gradually with the photon energy, and have a maximum value of +0.6 for both reactions. Comparison with theoretical predictions based on the Regge trajectory in the t channel and the contributions of nucleon resonances indicates the major role of t-channel contributions as well as non-negligible effects of nucleon resonances in accounting for the reaction mechanism of hyperon photoproduction in this photon energy regime.