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Charge asymmetry in electron (positron) scattering arises from theinterference of the Born amplitude and the box-type amplitude corresponding totwo virtual photons exchange. It can be extracted from electron proton andpositron proton scattering experiments, in the same kinematical conditions.Considering the virtual photon Compton scattering tensor, which contributes tothe box-type amplitude, we separate proton and inelastic contributions in theintermediate state and parametrize the proton form-factors as the sum of a pureQED term and a strong interaction term. Arguments based on analyticity aregiven in favor of cancellation of contributions from proton strong interactionform factors and of inelastic intermediate states in the box type amplitudes.In frame of this model, with a realistic expression for nucleon form-factors,numerical estimations are given for moderately high energies.

Charge asymmetry for electron (positron)-proton elastic scattering at large angle