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Differential cross section and photon-beam asymmetry for the gamma n --> K+ Sigma- reaction at E gamma = 1.5-2.4 GeV |
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| Authors: | Kohri H Ahn D S Ahn J K Akimune H Asano Y Chang W C Date' S Ejiri H Fukui S Fujimura H Fujiwara M Hasegawa S Hicks K Hotta T Imai K Ishikawa T Iwata T Kawai H Kim Z Y Kino K Kumagai N Makino S Mart T Matsuda T Matsumura T Matsuoka N Mibe T Miyabe M Miyachi Y Morita M Muramatsu N Nakano T Niiyama M Nomachi M Ohashi Y Ohkuma H Ooba T Oshuev D S Rangacharyulu C Sakaguchi A Sasaki T Shagin P M Shiino Y Shimizu A Shimizu H Sugaya Y Sumihama M Toi Y Toyokawa H Wakai A Wang C W Wang S C Yonehara K Yorita T Yoshimura M Yosoi M Zegers R G T;LEPS Collaboration |
| Institution: | Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan. |
| Abstract: | Differential cross sections and photon-beam asymmetries have been measured for the gamma n --> K+ Sigma- and gamma p --> K+Sigma0 reactions separately using liquid deuterium and hydrogen targets with incident linearly polarized photon beams of E gamma = 1.5-2.4 GeV at 0.6 < cos ThetacmK< 1. The cross section ratio of sigma K+ Sigma-/sigma K+ Sigma0, expected to be 2 on the basis of the isospin 1/2 exchange, is found to be close to 1. For the K+ Sigma- reaction, large positive asymmetries are observed, indicating the dominance of K* exchange. The large difference between the asymmetries for the K+ Sigma- and K+ Sigma0 reactions cannot be explained by simple theoretical considerations based on Regge model calculations. |
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