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 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