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We present a detailed next-to-leading order (NLO) leading twist QCD analysisof deeply virtual Compton scattering (DVCS) observables, for several differentinput scenarios, in the MS-bar scheme. We discuss the size of the NLO effectsand the behavior of the observables in skewedness $\zeta$, momentum transfer,$t$, and photon virtuality, $q^2=-Q^2$. We present results on the amplitudelevel for unpolarized and longitudinally polarized lepton probes, andunpolarized and longitudinally polarized proton targets. We make predictionsfor various asymmetries and for the DVCS cross section and compare with theavailable data.Comment: 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) correcte

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