Eur. Phys. J. C (2009) 63: 57-67
https://doi.org/10.1140/epjc/s10052-009-1087-y

Regular Article - Theoretical Physics

Generalised parton distributions at small x

¹ Department of Physics and Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, UK
² Department of Mathematical Sciences, University of Liverpool, Liverpool, L69 3BX, UK
³ Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, 188300, Russia

^* e-mail: thomas.teubner@liverpool.ac.uk

Received: 26 February 2009
Revised: 29 May 2009
Published online: 9 July 2009

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 requirements, 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.