Wu B 95-09 Virtual Compton Scattering off Protons at Moderately Large Momentum Transfer

The amplitudes for virtual Compton scattering o protons are calculated within the framework of the diquark model in which protons are viewed as being built up by quarks and diquarks. The latter objects are treated as quasi-elementary constituents of the proton. Virtual Compton scattering, electroproduction of photons and the Bethe-Heitler contamination are discussed for various kinematical situations. We particularly emphasize the rôle of the electron asymmetry for measuring the relative phases between the virtual Compton and the Bethe-Heitler amplitudes. It is also shown that the model is able to describe very well the experimental data for real Compton scattering o protons. Typeset using REVTEX [email protected] [email protected]