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arXiv · hep-ph/9710356

Diffractive Exclusive Photon Production in DIS at HERA

L. Frankfurt·A. Freund·M. Strikman
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Abstract

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 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.

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L. Frankfurt, A. Freund, M. Strikman. 1999-05-11. Diffractive Exclusive Photon Production in DIS at HERA. https://doi.org/10.1103/physrevd.58.114001%2010.1103%2Fphysrevd.59.119901

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