Timelike Compton scattering: exclusive photoproduction of lepton pairs

Details Timelike Compton scattering: exclusive photoproduction of lepton pairs Timelike Compton scattering: exclusive photoproduction of lepton pairs

2001-10-04

arxiv.org/abs/hep-ph/0110062v1

Eur.Phys.J.C23:675-689,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, 17 figures

Scientific paper

10.1007/s100520200917

We investigate the exclusive photoproduction of a heavy timelike photon which decays into a lepton pair, gamma p -> l+ l- p. This can be seen as the analog of deeply virtual Compton scattering, and we argue that the two processes are complementary for studying generalized parton distributions in the nucleon. In an unpolarized experiment the angular distribution of the leptons readily provides access to the real part of the Compton amplitude. We estimate the possible size of this effect in kinematics where the Compton process should be dominated by quark exchange.

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