新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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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 |
PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=51849122455&origin=inward |