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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 | 2009/08 |
| 形態種別 | 研究論文（国際会議プロシーディングス） |
| 査読 | 査読あり |
| 標題 | Photoproduction of Sigma(0)(1385) and Lambda(1405) on the proton near threshold |
| 執筆形態 | 単著 |
| 掲載誌名 | NUCLEAR PHYSICS A |
| 掲載区分 | 国外 |
| 出版社・発行元 | ELSEVIER SCIENCE BV |
| 巻・号・頁 | 827(1-4),pp.261C-263C |
| 担当区分 | 筆頭著者 |
| 著者・共著者 | Masayuki Niiyama |
| 概要 | Differential cross sections for gamma p -> K+Lambda(1405) and gamma p -> K+Sigma(0)(1385) reactions were measured in the photon energy range from 1.5 to 2.4 GeV and the angular range of 0.8 < cos(theta(K)) < 1.0 for the K+ scattering angle in the center-of-mass system at SPring-8/LEPS. This data is the first measurement of the Lambda(1405) photoproduction cross section. 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-gamma < 2.4 GeV). The observed ratio decreases in the higher photon energy region, which may suggest different production mechanisms and form factors for these hyperon resonances. |
| DOI | 10.1016/j.nuclphysa.2009.05.051 |
| ISSN | 0375-9474/1873-1554 |