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

N. Muramatsu, J. Y. Chen, W. C. Chang, D. S. Ahn, Jung Keun Ahn, H. Akimune, Y. Asano, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, S. Fukui, S. Hasegawa, K. Hicks, K. Horie, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, Y. KatoH. 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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30 Citations (Scopus)

Abstract

Photoproduction of Λ(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4GeV 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.

Original languageEnglish
Article number012001
JournalPhysical Review Letters
Volume103
Issue number1
DOIs
Publication statusPublished - 2009 Aug 6
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Muramatsu, N., Chen, J. Y., Chang, W. C., Ahn, D. S., Ahn, J. K., Akimune, H., Asano, Y., Daté, S., Ejiri, H., Fujimura, H., Fujiwara, M., Fukui, S., Hasegawa, S., Hicks, K., Horie, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., ... Zegers, R. G. T. (2009). Near-threshold photoproduction of Λ(1520) from protons and deuterons. Physical Review Letters, 103(1), [012001]. https://doi.org/10.1103/PhysRevLett.103.012001