NLO corrections to timelike, spacelike and double deeply virtual Compton scattering

Details NLO corrections to timelike, spacelike and double deeply virtual Compton scattering NLO corrections to timelike, spacelike and double deeply virtual Compton scattering

2011-01-03

arxiv.org/abs/1101.0555v1

Phys.Rev.D83:034009,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 11 eps figures

Scientific paper

10.1103/PhysRevD.83.034009

We calculate the O(alpha_s) corrections to the timelike, spacelike and double deeply virtual Compton scattering amplitudes in the generalized Bjorken scaling region. Special attention is devoted to studies of the difference between the next to leading order timelike and spacelike coefficient functions, which plays for this process a role analogous to the large K factor which was much discussed in the analysis of inclusive Drell Yan cross sections. Also in the present studies the timelike nature of the hard scale gives rise to new absorptive part of the amplitude and to the presence of characteristic pi^2 terms, which can potentially lead to sizeable corrections.

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