@article{143ba6e32e524e92a6a94c56d1fa9618,
title = "Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5-3.0 GeV",
abstract = "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.",
author = "{LEPS Collaboration} and Shiu, {S. H.} and H. Kohri and Chang, {W. C.} and Ahn, {D. S.} and Ahn, {J. K.} and Chen, {J. Y.} and S. Dat{\'e} and H. Ejiri and H. Fujimura and M. Fujiwara and S. Fukui and W. Gohn and K. Hicks and T. Hotta and Hwang, {S. H.} and K. Imai and T. Ishikawa and K. Joo and Y. Kato and Y. Kon and Lee, {H. S.} and Y. Maeda and T. Mibe and M. Miyabe and K. Mizutani and Y. Morino and N. Muramatsu and T. Nakano and Y. Nakatsugawa and M. Niiyama and H. Noumi and Y. Ohashi and T. Ohta and M. Oka and Parker, {J. D.} and C. Rangacharyulu and Ryu, {S. Y.} and T. Sawada and H. Shimizu and Y. Sugaya and M. Sumihama and T. Tsunemi and M. Uchida and M. Ungaro and M. Yosoi",
note = "Funding Information: The authors gratefully acknowledge the contributions of the SPring-8 staff for supporting BL33LEP beamline and the LEPS experiment. The experiments were performed at the BL33LEP of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) as a contract beamline (Proposal No. BL33LEP/6001). We thank T. Mart, J. Ryckebusch, S.-H. Kim, and A. Hosaka for fruitful discussions. This work was supported in part by the Ministry of Science and Technology of Taiwan, the Ministry of Education, Science, Sports and Culture of Japan, the National Research Foundation of Korea. and the US National Science Foundation. Publisher Copyright: {\textcopyright} 2018 American Physical Society.",
year = "2018",
month = jan,
day = "31",
doi = "10.1103/PhysRevC.97.015208",
language = "English",
volume = "97",
journal = "Physical Review C",
issn = "2469-9985",
publisher = "American Physical Society",
number = "1",
}