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Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV

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arxiv 0910.0900 v1 pith:RPAN7WN5 submitted 2009-10-06 nucl-ex

Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV

M. Sumihama , D.S. Ahn , J.K. Ahn , H. Akimune , Y. Asano , W.C. Chang , S. Date , H. Ejiri
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H. Fujimura M. Fujiwara S. Fukui S. Hasegawa K. Hicks T. Hotta K. Imai 0 T. Ishikawa T. Iwata Y. Kato H. Kawai K. Kino H. Kohri N. Kumagai T. Matsuda T. Matsumura T. Mibe M. Miyabe N. Muramatsu T. Nakano M. Niiyama M. Nomachi Y. Ohashi H. Ohkuma T. Ooba D.S. Oshuev C. Rangacharyulu 0 A. Sakaguchi P.M. Shagin Y. Shiino A. Shimizu H. Shimizu Y. Sugaya Y. Toi H. Toyokawa A. Wakai C.W. Wang S.C. Wang K. Yonehara T. Yorita M. Yoshimura M. Yosoi R.G.T. Zegers
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Differential cross sections for eta photoproduction off protons have been measured at E_gamma = 1.6 - 2.4 GeV in the backward direction. A bump structure has been observed above 2.0 GeV in the total energy. No such bump is observed in cross sections for eta', omega and pi0 photoproductions. It is inferred that this unique structure in eta photoproduction is due to a baryon resonance with a large portion of ss-bar strongly coupled to the etaN channel.

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