- Published 1998

We demonstrate that perturbative QCD allows one to calculate the absolute cross section of diffractive exclusive production of photons at large Q2 at HERA, while the aligned jet model allows one to estimate the cross section for intermediate Q2 ∼ 2GeV 2. Furthermore, we find that the imaginary part of the amplitude for the production of real photons is larger than the imaginary part of the corresponding DIS amplitude by about a factor of 2, leading to the prediction of a significant counting rate for the current generation of experiments at HERA. We also find a large azimuthal angle asymmetry in ep scattering for HERA kinematics which allows one to directly measure the real part of the DVCS amplitude and hence the nondiagonal parton distributions. PACS: 12.38.Bx, 13.85.Fb, 13.85.Ni.

@inproceedings{Frankfurt1998arXI,
title={ar X iv : h ep - p h / 97 10 35 6 v 3 1 2 Ju n 19 98 Diffractive Exclusive Photon Production in DIS at HERA},
author={Leonid L. Frankfurt and Anton Freund and Mark I. Strikman},
year={1998}
}