A detailed next-to-leading order QCD analysis of deeply virtual Compton scattering observables

Abstract

We present a detailed next-to-leading order (NLO) leading twist QCD analysis of deeply virtual Compton scattering (DVCS) observables, for several different input scenarios, in the MS-bar scheme. We discuss the size of the NLO effects and the behavior of the observables in skewedness $\zeta$, momentum transfer, $t$, and photon virtuality, $q^2=-Q^2$. We present results on the amplitude level for unpolarized and longitudinally polarized lepton probes, and unpolarized and longitudinally polarized proton targets. We make predictions for various asymmetries and for the DVCS cross section and compare with the available data.

38 pages, 40 figures, revtex, published version. Substantially shortened for publication: appendices and ten figures removed, sections III, IV and V condensed. Several physics points improved or corrected in response to referee's report. Incorrect citations and typo in eq.(3) corrected

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