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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 | 2018/03 |
| 形態種別 | その他 |
| 標題 | First measurement of coherent φ -meson photoproduction from He 4 near threshold |
| 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 | 97(3) |
| 著者・共著者 | T. Hiraiwa,T. Hiraiwa,M. Yosoi,M. Niiyama,Y. Morino,Y. Nakatsugawa,M. Sumihama,D. S. Ahn,J. K. Ahn,W. C. Chang,J. Y. Chen,S. Daté,H. Fujimura,S. Fukui,K. Hicks,T. Hotta,S. H. Hwang,T. Ishikawa,Y. Kato,H. Kawai,H. Kohri,Y. Kon,P. J. Lin,Y. Maeda,M. Miyabe,K. Mizutani,N. Muramatsu,T. Nakano,Y. Nozawa,Y. Ohashi,T. Ohta,M. Oka,C. Rangacharyulu,S. Y. Ryu,T. Saito,T. Sawada,H. Shimizu,E. A. Strokovsky,E. A. Strokovsky,Y. Sugaya,K. Suzuki,A. O. Tokiyasu,T. Tomioka,T. Tsunemi,M. Uchida,T. Yorita |
| 概要 | © 2018 American Physical Society. The differential cross sections and decay angular distributions for coherent φ-meson photoproduction from helium-4 are measured for the first time at forward angles with linearly polarized photons in the energy range Eγ=1.685-2.385GeV. Thanks to the target with spin-parity JP=0+, unnatural-parity exchanges are absent, and thus natural-parity exchanges can be investigated clearly. The decay asymmetry with respect to photon polarization is shown to be very close to the maximal value. This ensures the strong dominance (>94%) of natural-parity exchanges in this reaction. To evaluate the contribution from natural-parity exchanges to the forward cross section (θ=0â) for the γp→φp reaction near threshold, the energy dependence of the forward cross section (θ=0â) for the γHe4→φHe4 reaction is analyzed. The comparison to γp→φp data suggests that enhancement of the forward cross section arising from natural-parity exchanges and/or destructive interference between natural-parity and unnatural-parity exchanges is needed in the γp→φp reaction near threshold. |
| DOI | 10.1103/PhysRevC.97.035208 |
| ISSN | 2469-9985/2469-9993 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85045005726&origin=inward |