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题名: Meson exchange effects in elastic ep scattering at loop level and the electromagnetic form factors of the proton
作者: Chen, HY ;  Zhou, HQ
刊名: PHYSICAL REVIEW C
出版日期: 2014
卷号: 90, 期号:4, 页码:45205
关键词: 2-PHOTON-EXCHANGE
学科分类: Physics
DOI: 10.1103/PhysRevC.90.045205
通讯作者: Zhou, HQ (reprint author), Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China.
部门归属: [Chen, Hong-Yu ;  Zhou, Hai-Qing] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China ;  [Zhou, Hai-Qing] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
英文摘要: A new form of two-photon exchange (TPE) effect is studied to explain the discrepancy between unpolarized and polarized experimental data in elastic ep scattering. The mechanism is based on a simple idea that apart from the usual TPE effects from box and crossed-box diagrams, the mesons may also be exchanged in elastic ep scattering by two-photon coupling at loop level. The detailed study shows such contributions to reduced unpolarized cross section (sigma(un)) and polarized observables (P-t, P-l) at fixed Q(2) are only dependent on proton's electromagnetic form factors G(E,M) and a new unknown universal parameter g. After combining this contribution with the usual TPE contributions from box and crossed-box diagrams, the ratio mu(p)G(E)/G(M) extracted from the recent precise unpolarized and polarized experimental data can be described consistently.
资助者: National Sciences Foundations of China [11375044]; Fundamental Research Funds for the Central Universities [2242014R30012]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000344026700002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15619
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Chen, HY,Zhou, HQ. Meson exchange effects in elastic ep scattering at loop level and the electromagnetic form factors of the proton[J]. PHYSICAL REVIEW C,2014,90(4):45205.
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