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Boër, M.; Guidal, M.; Vanderhaeghen, M.
The European physical journal. A, Hadrons and nuclei, 08/2015, Letnik: 51, Številka: 8Journal Article
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 γP → 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.
