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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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| 発行・発表の年月 | 2018/01 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Differential cross section and photon-beam asymmetry for the γ - p→π+n reaction at forward π+ angles at Eγ=1.5 -2.95 GeV |
| 執筆形態 | その他 |
| 掲載誌名 | Physical Review C |
| 巻・号・頁 | 97(1) |
| 著者・共著者 | H. Kohri,S. Y. Wang,S. H. Shiu,W. C. Chang,Y. Yanai,D. S. Ahn,J. K. Ahn,J. Y. Chen,S. Daté,H. Ejiri,H. Fujimura,M. Fujiwara,S. Fukui,W. Gohn,K. Hicks,A. Hosaka,T. Hotta,S. H. Hwang,K. Imai,T. Ishikawa,K. Joo,Y. Kato,S. H. Kim,Y. Kon,H. S. Lee,Y. Maeda,T. Mibe,M. Miyabe,Y. Morino,N. Muramatsu,T. Nakano,Y. Nakatsugawa,M. Niiyama,H. Noumi,Y. Ohashi,T. Ohta,M. Oka,J. D. Parker,C. Rangacharyulu,S. Y. Ryu,T. Sawada,H. Shimizu,Y. Sugaya,M. Sumihama,T. Tsunemi,M. Uchida,M. Ungaro,M. Yosoi |
| 概要 | © 2018 American Physical Society. Differential cross sections and photon-beam asymmetries for the γ - p→π+n reaction have been measured for 0.6<cosθπ<1 and Eγ=1.5-2.95GeV at SPring-8/LEPS. The cross sections monotonically decrease as the photon beam energy increases for 0.6<cosθπ<0.9. However, the energy dependence of the cross sections for 0.9<cosθπ<1 and Eγ=1.5-2.2GeV (W=1.9-2.2GeV) is different, which may be due to a nucleon or Δ resonance. The present cross sections agree well with the previous cross sections measured by other groups and show forward peaking, suggesting significant t-channel contributions in this kinematical region. The asymmetries are found to be positive, which can be explained by ρ exchange in the t channel. Large positive asymmetries in the small-|t| region, where the ρ-exchange contribution becomes small, could be explained by introducing π-exchange interference with the s channel. |
| DOI | 10.1103/PhysRevC.97.015205 |
| ISSN | 2469-9985/2469-9993 |