Double deeply virtual Compton scattering off the nucleon

Details Double deeply virtual Compton scattering off the nucleon Double deeply virtual Compton scattering off the nucleon

2002-08-30

arxiv.org/abs/hep-ph/0208275v1

Phys.Rev.Lett. 90 (2003) 012001

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.90.012001

We study the double deeply virtual Compton scattering (DDVCS) process off the nucleon, through the scattering of a spacelike virtual photon with large virtuality resulting in the production of a timelike virtual photon, decaying into an e^+ e^- pair. This process is expressed in the Bjorken regime in terms of generalized parton distributions (GPDs) and it is shown that by varying the invariant mass of the lepton pair, one can directly extract the GPDs from the observables. We give predictions for the DDVCS cross section and beam helicity asymmetry and discuss its experimental feasibility.

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