Fitting DVCS at NLO and beyond

Details Fitting DVCS at NLO and beyond Fitting DVCS at NLO and beyond

2007-10-30

arxiv.org/abs/0710.5649v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures

Scientific paper

We outline the twist-two analysis of deeply virtual Compton scattering (DVCS)within the conformal partial wave expansion of the amplitude, represented as a Mellin--Barnes integral. The complete next-to-leading order results, including evolution, are obtained in the MS and a conformal factorization scheme. Within the latter, exploiting conformal symmetry, the radiative corrections are evaluated up to next-to-next-to-leading order. Using a new proposed parameterization for GPDs, we study the convergence of perturbation theory and demonstrate for H1 and ZEUS measurements that our formalism is suitable for a fitting procedure of DVCS observables. We comment on a recent claim of a breakdown of collinear factorization and show that a Regge-inspired Q^2 scaling law is ruled out by small x_Bj DVCS data.

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