Spin effects in deeply virtual Compton scattering

Abstract

We consider the azimuthal angle dependence in the cross section of the hard leptoproduction of a photon on a nucleon target. We show that this dependence allows to define observables that isolate the twist-two and twist-three sectors in the deeply virtual Compton scattering amplitude. All twist-two and twist-three Compton form factors can be extracted from measurements of the charge odd part of the polarized cross section and give access to all generalized parton distributions.Comment: 6 pages, LaTeX, 1 figure, Talk given at IX International Workshop on Deep Inelastic Scattering Bologna, 27 April - 1 May 200