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 |
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| Affiliation: | Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan. |
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| 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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