Deeply Virtual Compton Scattering at HERA

TL;DR

This paper reports precise measurements of Deeply Virtual Compton Scattering at HERA across a broad kinematic range, comparing results with theoretical models to enhance understanding of proton structure.

Contribution

It provides the most accurate DVCS cross section measurements at HERA over an extended kinematic domain, testing QCD and dipole models.

Findings

Measurements agree with NLO QCD predictions

Results support Colour Dipole model validity

Extended kinematic coverage improves proton structure insights

Abstract

The Deeply Virtual Compton Scattering (DVCS) $\gamma^* p \to \gamma p$ cross section has been measured with the H1 detector at HERA with an increased precision and in an extended kinematic domain: at photon virtualities $4<Q^2<80$ GeV$^2$, and photon-proton c.m.s. energy $30<W<140$ GeV. The measurement is compared to NLO QCD calculations and to Colour Dipole model predictions.