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Double deeply virtual Compton scattering off the nucleon

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arxiv hep-ph/0208275 v1 pith:M52WKKMI submitted 2002-08-30 hep-ph

Double deeply virtual Compton scattering off the nucleon

classification hep-ph
keywords virtualscatteringcomptonddvcsdeeplydoublegpdsnucleon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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