Deeply Virtual Compton Scattering at HERA

TL;DR

This paper reports measurements of deeply virtual Compton scattering at HERA, comparing experimental cross sections and asymmetries with QCD predictions across various kinematic regimes.

Contribution

It provides new cross section and asymmetry measurements from HERA experiments, enhancing understanding of DVCS and testing QCD models in different kinematic regions.

Findings

Measured DVCS cross sections in 2<Q^2<100 GeV^2 and 30<W<140 GeV.

Observed azimuthal asymmetries and their dependence on kinematic variables.

Compared experimental results with QCD-based theoretical calculations.

Abstract

Deeply virtual Compton scattering has recently been studied by three HERA experiments, H1, ZEUS and HERMES, covering a broad range of kinematic regimes. We present cross section measurements of the two collider experiments in the kinematic region 2<Q^2<100 GeV^2 and 30<W<140 GeV, and compare them to QCD-based calculations. HERMES measurements of azimuthal asymmetries and their kinematical dependences are presented for Q^2>1 GeV^2 and 2<W<7 GeV.