Differential cross section and photon-beam asymmetry for the gamma(->)p -> pi(-)delta(+ +) (1232) reaction at forward pi(-) angles for e-gamma=1.5-2.95 gev
文献类型：期刊论文
| 作者 | Kohri, H.1,2; Shiu, S. H.2,3; Chang, W. C.2; Yanai, Y.1; Ahn, D. S.4; Ahn, J. K.5; Chen, J. Y.6; Date, S.7; Ejiri, H.1; Fujimura, H.8 |
| 刊名 | Physical review letters
 |
| 出版日期 | 2018-05-18 |
| 卷号 | 120期号:20页码:6 |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/physrevlett.120.202004 |
| 通讯作者 | Kohri, h.() |
| 英文摘要 | Differential cross sections and photon-beam asymmetries for the gamma(->)p -> pi(-)delta(++)(1232) reaction have been measured for 0.7 < cos theta(c.m.)(pi) < 1 and e-gamma= 1.5-2.95 gev at spring-8/leps. the first-ever high statistics cross-section data are obtained in this kinematical region, and the asymmetry data for 1.5 < e-gamma(gev) < 2.8 are obtained for the first time. this reaction has a unique feature for studying the production mechanisms of a pure uu quark pair in the final state from the proton. although there is no distinct peak structure in the cross sections, a non-negligible excess over the theoretical predictions is observed at e-gamma= 1.5-1.8 gev. the asymmetries are found to be negative in most of the present kinematical regions, suggesting the dominance of n exchange in the t channel. the negative asymmetries at forward meson production angles are different from the asymmetries previously measured for the photoproduction reactions producing a dd(-) or an ss quark pair in the final state. advanced theoretical models introducing nucleon resonances and additional unnatural-parity exchanges are needed to reproduce the present data. |
| WOS关键词 | PSEUDOSCALAR-MESON PHOTOPRODUCTION ; POLARIZED PHOTONS ; HYDROGEN ; ENERGIES ; DEUTERIUM ; BARYONS ; PROTON ; ETA |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000433032500005 |
| 出版者 | AMER PHYSICAL SOC |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2177493 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Kohri, H. |
| 作者单位 | 1.Osaka Univ, Res Ctr Nucl Phys, Ibaraki, Osaka 5670047, Japan 2.Acad Sinica, Inst Phys, Taipei 11529, Taiwan 3.Natl Cent Univ, Dept Phys, Taoyuan 32001, Taiwan 4.RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan 5.Korea Univ, Dept Phys, Seoul 02841, South Korea 6.Natl Synchrotron Radiat Res Ctr, Light Source Div, Hsinchu 30076, Taiwan 7.Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795143, Japan 8.Wakayama Med Coll, Wakayama 6418509, Japan 9.Natl Inst Quantum & Radiol Sci & Technol, Tokai, Ibaraki 3191195, Japan 10.Univ Connecticut, Dept Phys, Storrs, CT 06269 USA |
| 推荐引用方式 GB/T 7714 | Kohri, H.,Shiu, S. H.,Chang, W. C.,et al. Differential cross section and photon-beam asymmetry for the gamma(->)p -> pi(-)delta(+ +) (1232) reaction at forward pi(-) angles for e-gamma=1.5-2.95 gev[J]. Physical review letters,2018,120(20):6. |
| APA | Kohri, H..,Shiu, S. H..,Chang, W. C..,Yanai, Y..,Ahn, D. S..,...&Yosoi, M..(2018).Differential cross section and photon-beam asymmetry for the gamma(->)p -> pi(-)delta(+ +) (1232) reaction at forward pi(-) angles for e-gamma=1.5-2.95 gev.Physical review letters,120(20),6. |
| MLA | Kohri, H.,et al."Differential cross section and photon-beam asymmetry for the gamma(->)p -> pi(-)delta(+ +) (1232) reaction at forward pi(-) angles for e-gamma=1.5-2.95 gev".Physical review letters 120.20(2018):6. |
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