Regge Exchange Contribution to Deeply Virtual Compton Scattering

Assuming that the energy dependence of quasi on-shell parton-nucleon interactions can be parametrized in terms of J-plane singularities we explore consequences of Regge behavior for Deeply Virtual Compton Scattering (DVCS). In particular we find that resulting generalized parton distributions develop singularities which prevent the use of collinear factorization. The microscopic interpretation is that DVCS is dominated by photon dissociation into a quark-antiquark pair with subsequent re-scattering on target constituents rather than scattering on partons forming the target bound state. (authors)