Deeply virtual Compton scattering in next-to-leading order

TL;DR

This paper calculates the next-to-leading order corrections to deeply virtual Compton scattering amplitudes, highlighting their magnitude and dependence on skewed parton distributions, aiding future experimental data interpretation.

Contribution

It provides the first detailed analysis of two-loop evolution effects and radiative corrections in DVCS at NLO, improving theoretical predictions.

Findings

Radiative corrections are 20-50% in the minimal subtraction scheme.

Predictions depend significantly on the choice of skewed parton distributions.

The study discusses theoretical uncertainties from radiative corrections.

Abstract

We study the amplitude of deeply virtual Compton scattering in next-to-leading order of perturbation theory including the two-loop evolution effects for different sets of skewed parton distributions (SPDs). It turns out that in the minimal subtraction scheme the relative radiative corrections are of order 20-50%. We analyze the dependence of our predictions on the choice of SPD, that will allow to discriminate between possible models of SPDs from future high precision experimental data, and discuss shortly theoretical uncertainties induced by the radiative corrections.