Fitting DVCS at NLO and beyond
arXiv:0710.5649 · doi:10.1142/9789812796950_0005
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.
15 pages, 4 figures
References in corpus (1)
Cited by in corpus (5)
- Sum rules and dualities for generalized parton distributions: is there a holographic principle?
- Deeply Virtual Compton Scattering at a Proposed High-Luminosity Electron-Ion Collider
- Educing GPDs from amplitudes of hard exclusive processes
- DVCS and the skewness effect at small x
- Generalized Parton Distributions and Hadronic Observables