DVCS at HERA

Details DVCS at HERA DVCS at HERA

1998-06-18

arxiv.org/abs/hep-ph/9806406v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, using sprocl.sty file, to appear in the proceedings of DIS'98, Brussels, April'98

Scientific paper

We demonstrate that perturbative QCD allows one to calculate the absolute cross section of diffractive exclusive production of photons at large $Q^2$ at HERA, while the aligned jet model allows one to estimate the cross section for intermediate $Q^2 \sim 2 GeV^2$. 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 a factor of about 2, leading to predictions 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.

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