Evidence for breakdown of the DGLAP description in diffractive DIS at HERA

Abstract

HERA data on diffractive DIS show deviations from twist 2 DGLAP predictions below $Q^2\sim 5$ GeV$^2$ at low pomeron $\xi$, which may reach up to 100%. These deviations are consistent with higher twists effects extracted from the saturation model. It is a first direct evidence for the higher twists in DIS. This finding affects determination of the diffractive parton densities that are used for the predictions at the LHC.Comment: 5 pages, 2 figures, Based on the talk presented at the conference Deep-Inelastic Scattering and Related Subjects (DIS2012), Bonn, 201