paper

Deeply virtual Compton scattering beyond next-to-leading order: the flavor singlet case

arXiv:hep-ph/0605237 · doi:10.1016/j.physletb.2007.02.071

Abstract

We study radiative corrections to deeply virtual Compton scattering in the kinematics of HERA collider experiments to next--to--leading and next--to--next--to--leading order. In the latter case the radiative corrections are evaluated in a special scheme that allows us to employ the predictive power of conformal symmetry. As observed before, the size of next--to--leading order corrections strongly depends on the gluonic input, as gluons start to contribute at this order. Beyond next--to--leading order we find, in contrast, that the corrections for an input scale of few GeV^2 are small enough to justify the uses of perturbation theory. For the modification of the scale dependence is also small. However, with decreasing it becomes moderate or even large, in particular for the phase.

17 pages, 2 figures

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