DVCS at HERA and at CERN

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.

Comments: 7 pages, 9 figures, proceedings of Photon09, 11-15 may 2009, DESY, Hamburg, Germany