On timelike Compton scattering at medium and high energies

Details On timelike Compton scattering at medium and high energies On timelike Compton scattering at medium and high energies

2011-07-15

arxiv.org/abs/1107.3015v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, Presented at the workshop "30 years of strong interactions", Spa, Belgium, 6-8 April 2011

Scientific paper

We emphasize the complementarity of timelike and spacelike studies of deep exclusive processes, taking as an example the case of timelike Compton Scattering (TCS) i.e. the exclusive photoproduction of a lepton pair with large invariant mass, vs deeply virtual Compton scattering (DVCS) i.e. the exclusive leptoproduction of a real photon. Both amplitudes factorize with the same generalized parton distributions (GPDs) as their soft parts and coefficient functions which differ significantly at next to leading order in alpha_s. We also stress that data on TCS at very high energy should be available soon thanks to the study of ultraperipheral collisions at the LHC, opening a window on quark and gluon GPDs at very small skewness.

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