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arxiv: 0904.2034 · v2 · submitted 2009-04-14 · ⚛️ nucl-ex

Near-threshold photoproduction of Λ(1520) from protons and deuterons

LEPS Collaboration: N. Muramatsu , J. Y. Chen , W. C. Chang , D. S. Ahn , J. K. Ahn , H. Akimune , Y. Asano , S. Dat\'e
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H. Ejiri H. Fujimura M. Fujiwara S. Fukui S. Hasegawa K. Hicks K. Horie T. Hotta K. Imai T. Ishikawa T. Iwata Y. Kato H. Kawai K. Kino H. Kohri N. Kumagai S. Makino T. Matsuda T. Matsumura N. Matsuoka T. Mibe M. Miyabe M. Miyachi T. Nakano M. Niiyama M. Nomachi Y. Ohashi H. Ohkuma T. Ooba D. S. Oshuev C. Rangacharyulu A. Sakaguchi P. M. Shagin Y. Shiino H. Shimizu Y. Sugaya M. Sumihama 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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keywords asymmetrycrossprotonssectionsanglesdeuteriumdifferentialenergies
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Photoproduction of $\Lambda$(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K$^{+/0}$ angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K$^+$ angles.

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