Extraction of the Skewing factor from the DIS/DVCS ratio

Abstract

The skewing factor, defined as the ratio of the imaginary parts of the amplitudes $ImA({\gamma }^{\ast }p\to {\gamma }^{\ast }p)/ImA({\gamma }^{\ast }p\to \gamma p)$ is extracted for the first time from the data using recent Deeply Virtual Compton Scattering (DVCS) and the inclusive inelastic cross section measurements at DESY-HERA. The results values are compared to theoretical predictions for NLO QCD and the colour dipole approach.

Comments: 15 pages, 5 figures