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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 Lambda(1405) and Sigma(0)(1385) on the proton at E-gamma=1.5-2.4 GeV |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW C |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 78(3) |
| 著者・共著者 | 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. Date,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 gamma p -> K+ Lambda (1405) and gamma p -> K+ Sigma(0) (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(Theta) < 1.0 for the K+ scattering angle in the center-of-mass system. This data is the first measurement of the Lambda (1405) photoproduction cross section. The line shapes of Lambda (1405) measured in Sigma(+) pi(-) and Sigma(-) pi(+) decay modes were different with each other, indicating a strong interference of the isospin 0 and 1 terms of the Sigma pi scattering amplitudes. The ratios of Lambda (1405) production to Sigma(0) (1385) production were measured in two photon energy ranges: near the production threshold (1.5 < E-gamma < 2.0 GeV) and far from it ( 2.0 < E. < 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. |
| DOI | 10.1103/PhysRevC.78.035202 |
| ISSN | 2469-9985/2469-9993 |