Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-10-14
Phys.Rev. D58 (1998) 114001; Erratum-ibid. D59 (1999) 119901
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 11 figures, published version with incorporated erratum
Scientific paper
10.1103/PhysRevD.58.114001
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.
Frankfurt Leonid L.
Freund Andreas
Strikman Mark
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