Deeply virtual compton scattering at HERA - A probe of asymptotia

We demonstrate that the measurement of an azimuthal angle asymmetry in deep ly virtual Compton scattering (DVCS) at HERA energies, is experimentally fe asible and allows one to determine for the first time the ratio, eta, of th e real to imaginary part of the DIS amplitude. We further show that such me asurements would discriminate between different scenarios for the energy de pendence of F-2(x,Q(2)) at energies beyond those reachable at HERA. (C) 199 9 Published by Elsevier Science B.V. All rights reserved.