期刊
EUROPEAN PHYSICAL JOURNAL A
卷 51, 期 8, 页码 -出版社
SPRINGER
DOI: 10.1140/epja/i2015-15103-3
关键词
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资金
- Deutsche Forschungsgemeinschaft DFG through the Collaborative Research Center The Low-Energy Frontier of the Standard Model [SFB 1044]
- Deutsche Forschungsgemeinschaft DFG through the Cluster of Excellence Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA)
- Joint Research Activity GPDex of the European program Hadron Physics 3 under the Seventh Framework Programme of the European Community
- GDR [3034]
- [ANR-12-MONU-0 008-01]
We study the exclusive photoproduction of a lepton pair off the proton with the aim of studying the proton quark structure via the Generalized Parton Distributions (GPD) formalism. After deriving the amplitudes of the processes contributing to the gamma P --> P'e(+)e(-), the timelike Compton scattering and the Bethe-Heitler process, we calculate all unpolarized, single- and double- spin beam-target observables in the valence region in terms of GPDs.
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