Near-threshold Lambda(1520) production by the gamma p -> K+Lambda(1520) reaction at forward K+ angles

H. Kohri , D.S. Ahn , J.K. Ahn , H. Akimune , W.C. Chang , S. Date' , H. Ejiri , S. Fukui

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H. Fujimura M. Fujiwara K. Hicks A. Hosaka T. Hotta K. Imai T. Ishikawa T. Iwata K. Kino S. Makino T. Matsuda T. Matsumura T. Mibe M. Miyabe Y. Miyachi N. Muramatsu T. Nakano S.I. Nam M. Niiyama M. Nomachi Y. Ohashi C. Rangacharyulu A. Sakaguchi H. Shimizu Y. Sugaya M. Sumihama A.I. Titov Y. Toi K. Yonehara T. Yorita M. Yosoi R.G.T. Zegers (LEPS Collaboration)

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classification ✦ hep-ex

keywords bumpcrosslambdareactionsectionsgammanucleonresonance

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Differential cross sections and photon-beam asymmetries for the gamma p -> K+ Lambda(1520) reaction have been measured with linearly polarized photon beams at energies from the threshold to 2.4 GeV at 0.6<cos(theta)<1. A new bump structure was found at W=2.11 GeV in the cross sections. The bump is not well reproduced by theoretical calculations introducing a nucleon resonance with J<=3/2. This result suggests that the bump might be produced by a nucleon resonance possibly with J>=5/2 or by a new reaction process, for example an interference effect with the phi photoproduction having a similar bump structure in the cross sections.

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Near-threshold Lambda(1520) production by the gamma p -> K+Lambda(1520) reaction at forward K+ angles

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