Fitting DVCS at NLO and beyond
Abstract
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.
Cite
@article{arxiv.0710.5649,
title = {Fitting DVCS at NLO and beyond},
author = {K. Kumerički and D. Müller and K. Passek-Kumerički},
journal= {arXiv preprint arXiv:0710.5649},
year = {2017}
}
Comments
15 pages, 4 figures