Lepton-Pair Production in Virtual Compton Scattering off the Proton

Details Lepton-Pair Production in Virtual Compton Scattering off the Proton Lepton-Pair Production in Virtual Compton Scattering off the Proton

1997-01-21

arxiv.org/abs/nucl-th/9701042v1

Phys.Lett. B402 (1997) 1-6

Physics

Nuclear Physics

Nuclear Theory

8 pages, LaTeX , 2 figures. To appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)00389-4

We show that lepton-pair production in Virtual Compton Scattering offers, through interference with the well-known Bethe-Heitler process, a sensitive probe to learn the longitudinal response of resonances and the electromagnetic nucleon form factors. This interference can be measured directly in terms of an asymmetry. The role of off-shell effects in the N-N-$\gamma$ vertices is investigated as well. An additional N-N-$\gamma -\gamma$ contact term in the amplitude, included to ensure gauge invariance of the model, cancels a substantial part of the off-shell effects.

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