新山 雅之
   所属   京都産業大学  理学部 物理科学科
   職種   教授
言語種別 英語
発行・発表の年月 2008/09
形態種別 研究論文
査読 査読あり
標題 Photoproduction of Λ(1405) and Σ0(1385) on the proton at Eγ=1.5-2.4 GeV
執筆形態 その他
掲載誌名 Physical Review C - Nuclear Physics
巻・号・頁 78
著者・共著者 M. Niiyama,M. Niiyama,H. Fujimura,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. Kohri,S. 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
概要 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. © 2008 The American Physical Society.
DOI 10.1103/PhysRevC.78.035202
ISSN 0556-2813
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