Photoproduction of Λ(1405) and Σ0(1385) on the proton at Eγ=1.5-2.4 GeV

M. Niiyama, H. Fujimura, D. S. Ahn, J. K. Ahn, S. Ajimura, H. C. Bhang, T. H. Chang, W. C. Chang, J. Y. Chen, S. Daté, S. Fukui, H. Funahashi, K. Hicks, K. Horie, T. Hotta, K. Imai, T. Ishikawa, Y. Kato, K. Kino, H. KohriS. Makino, T. Matsumura, T. Mibe, K. Miwa, M. Miyabe, N. Muramatsu, M. Nakamura, T. Nakano, Y. Nakatsugawa, Y. Ohashi, D. S. Oshuev, J. D. Parker, N. Saito, T. Sawada, Y. Sugaya, M. Sumihama, J. L. Tang, M. Uchida, C. W. Wang, T. Yorita, M. Yosoi

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Abstract

Differential cross sections for γp→K+Λ(1405) and γp→K+Σ0(1385) reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and the angular range of 0.8<cos(Θ)<1.0 for the K+ scattering angle in the center-of-mass system. This data is the first measurement of the Λ(1405) photoproduction cross section. The line shapes of Λ(1405) measured in Σ+π- and Σ-π+ decay modes were different with each other, indicating a strong interference of the isospin 0 and 1 terms of the Σπ scattering amplitudes. The ratios of Λ(1405) production to Σ0(1385) production were measured in two photon energy ranges: near the production threshold (1.5<Eγ<2.0 GeV) and far from it (2.0<Eγ<2.4 GeV). The observed ratio decreased in the higher photon energy region, which may suggest different production mechanisms and internal structures for these hyperon resonances.

Original languageEnglish
Article number035202
JournalPhysical Review C - Nuclear Physics
Volume78
Issue number3
DOIs
Publication statusPublished - 2008 Sep 9

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Niiyama, M., Fujimura, H., Ahn, D. S., Ahn, J. K., Ajimura, S., Bhang, H. C., Chang, T. H., Chang, W. C., Chen, J. Y., Daté, S., Fukui, S., Funahashi, H., Hicks, K., Horie, K., Hotta, T., Imai, K., Ishikawa, T., Kato, Y., Kino, K., ... Yosoi, M. (2008). Photoproduction of Λ(1405) and Σ0(1385) on the proton at Eγ=1.5-2.4 GeV. Physical Review C - Nuclear Physics, 78(3), [035202]. https://doi.org/10.1103/PhysRevC.78.035202