Generalised parton distributions at small x

Abstract

We justify the practical use of the Shuvaev integral transform approach to calculate the skewed distributions, needed to describe diffractive processes, directly from the conventional diagonal global parton distributions. We address doubts which have been raised about this procedure. We emphasise that the approach, on the one hand, satisfies all theoretical reqirements, and, on the other hand, is consistent with DVCS data at NLO. We construct an easily accessible package for the computation of these skewed distributions.

21 pages, 10 figures. New title. Extra Fig. 2 and extra Section 5 to compare with alternative treatment of GPDs. Numerical results unchanged. To be published in EPJC

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Cited by in corpus (12)

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• Exclusive $J/\psi$ and ${\rm Y}$ photoproduction and the low $x$ gluon
• Towards a fitting procedure to deeply virtual meson production -- the next-to-leading order case --
• Exclusive $J/\psi$ photoproduction in ultraperipheral Pb+Pb collisions at the LHC to next-to-leading order perturbative QCD
• Generalized Parton Distributions: visions, basics, and realities
• How to include exclusive $J/\psi$ production data in global PDF analyses
• Very low $x$ gluon density determined by LHCb exclusive $J/\psi$ data
• A simple form for the low-x generalized parton distributions in the skewed regime
• Exclusive production of quarkonia as a probe of the GPD E for gluons
• NLO corrections to the deeply virtual meson production revisited: impact on the extraction of generalized parton distributions
• The dual parametrization for gluon GPDs