On the structure of the virtual Compton amplitude in the generalized Bjorken region:: integral relations

A systematic study is performed of the structure of the twist-2 contributions to the virtual Compton amplitude in deep-inelastic non-forward scattering for general spin states in the non-local light cone expansion. The gauge invariance is proven in this approach for the twist-2 contributions for nonforward scattering. Relations are derived between the contributing non-forward amplitudes. (C) 2000 Elsevier Science B.V. All rights reserved.