The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV

M. Sumihama, J. K. Ahn, H. Akimune, Y. Asano, C. Bennhold, W. C. Chang, T. Corthals, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, M. Guidal, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, H. Kawai, Z. Y. Kim, K. KinoH. Kohri, N. Kumagai, S. Makino, T. Mart, T. Matsumura, N. Matsuoka, T. Mibe, M. Miyabe, Y. Miyachi, M. Morita, N. Muramatsu, T. Nakano, M. Niiyama, M. Nomachi, Y. Ohashi, T. Ooba, H. Ohkuma, D. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sasaki, P. M. Shagin, Y. Shiino, H. Shimizu, Y. Sugaya, H. Toyokawa, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yosoi, R. G.T. Zegers

研究成果: 雜誌貢獻期刊論文同行評審

174 引文 斯高帕斯(Scopus)

摘要

Differential cross sections and photon-beam asymmetries for the γ→p→K+Λ and γ→p→K+Σ0 reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from Θc.m.=0° to 60° of the K+ scattering angle in the center-of-mass system at the SPring-8/LEPS facility. The photon-beam asymmetries for both the reactions have been found to be positive and to increase with the photon energy. The measured differential cross sections agree with the data measured by the CLAS Collaboration at cosΘc.m.<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K+Λ reaction is large at cosΘc.m.>0.9. In the K+Λ reaction, the resonance-like structure found in the CLAS and SAPHIR data at W=1.96 GeV is confirmed. The differential cross sections at forward angles suggest a strong K-exchange contribution in the t-channel for the K+Λ reaction, but not for the K+Σ0 reaction.

原文???core.languages.en_GB???
文章編號035214
期刊Physical Review C - Nuclear Physics
73
發行號3
DOIs
出版狀態已出版 - 2006

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