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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 | 2003/08 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Beam-polarization asymmetries for the p((gamma)over-right-arrow,K+)Lambda and p((gamma)over-right-arrow,K+)Sigma(0) reactions for E-gamma=1.5-2.4 GeV |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICAL REVIEW LETTERS |
| 出版社・発行元 | AMER PHYSICAL SOC |
| 巻・号・頁 | 91(9) |
| 著者・共著者 | RGT Zegers,M Sumihama,DS Ahn,JK Ahn,H Akimune,Y Asano,WC Chang,S Date,H Ejiri,H Fujimura,M Fujiwara,K Hicks,T Hotta,K Imai,T Ishikawa,T Iwata,H Kawai,ZY Kim,K Kino,H Kohri,N Kumagai,S Makino,T Matsumura,N Matsuoka,T Mibe,K Miwa,M Miyabe,Y Miyachi,M Morita,N Muramatsu,T Nakano,M Niiyama,M Nomachi,Y Ohashi,T Ooba,H Ohkuma,DS Oshuev,C Rangacharyulu,A Sakaguchi,T Sasaki,PM Shagin,Y Shiino,H Shimizu,Y Sugaya,H Toyokawa,A Wakai,CW Wang,SC Wang,K Yonehara,T Yorita,M Yoshimura,M Yosoi |
| 概要 | Beam polarization asymmetries for the p((gamma) over right arrow ,K+)Lambda and p((gamma) over right arrow ,K+)Sigma(0) reactions are measured for the first time for E-gamma=1.5-2.4 GeV and 0.6<cos(theta(K)(+c.m.))<1.0 by using linearly polarized photons at the Laser-Electron-Photon facility at SPring-8 (LEPS). The observed asymmetries are positive and gradually increase with rising photon energy. The data are not consistent with theoretical predictions based on tree-level effective-Lagrangian approaches. Including the new results in the development of the models is, therefore, crucial for understanding the reaction mechanism and to test the presence of baryon resonances which are predicted in quark models but are thus far undiscovered. |
| DOI | 10.1103/PhysRevLett.91.092001 |
| ISSN | 0031-9007/1079-7114 |