DVCS at HERA and at CERN

TL;DR

This paper reviews recent DVCS data from HERA and discusses its implications for understanding the proton's spatial structure, also presenting future measurement prospects at CERN's COMPASS experiment.

Contribution

It provides a detailed analysis of recent experimental data and explores their impact on models of the proton's transverse structure, including upcoming measurements at CERN.

Findings

Recent HERA data constrain models of proton structure.

Beam Charge Asymmetry measurements inform on parton spatial distribution.

Future DVCS measurements at CERN will enhance understanding of proton tomography.

Abstract

Deeply Virtual Compton Scattering (DVCS) in $ep$ collisions has emerged in recent years as a an essential reaction to obtain information on the correlation of partons in the hadron (proton) or on the transverse distribution of these partons. In these proceedings, we examine the lattest data from HERA (at low $x_{Bj}<10^{-2}$) and their impact on models. We analyse in detail what these data imply on the spatial structure of the proton. In particular, the most recent measurements of the Beam Charge Asymmetry by the H1 experiment is discussed in this context. Perspectives are presented for further measurements of DVCS cross sections at CERN, within the COMPASS experiment.