Generalised parton distributions at small x

TL;DR

This paper validates the use of the Shuvaev integral transform to derive skewed parton distributions from conventional distributions, ensuring theoretical consistency and agreement with experimental data, and provides a practical computational package.

Contribution

It demonstrates the validity of the Shuvaev transform for small x skewed distributions and offers a user-friendly computational tool.

Findings

The approach satisfies all theoretical requirements.

It is consistent with NLO DVCS data.

Provides an accessible computational package.

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.