We consider deeply virtual Compton scattering and deep inelastic scattering in presence of Regge exchanges. Recently, we have proposed a model in which the diffractive phenomena that are expected to govern the low-x B DIS are incorporated at the parton nucleon level [1,2]. Such effective parton-nucleon amplitude gives the correct description of low-x structure functions. Surprisingly, however, we have found that in the case of DVCS it breaks collinear factorization, i.e. Bjorken scaling, while it naturally leads to the Regge-type scaling, as it was in fact predicted by Bjorken and Kogut in [3]. In particular, we discuss the contribution of the Pomeron exchange to DVCS in HERA kinematics. A new fit of the DVCS total cross section data from H1 and ZEUS is proposed.

No abstract