SEMICLASSICAL APPROACH TO STRUCTURE FUNCTIONS AT SMALL-X

Inclusive and diffractive structure functions for electron-proton scat tering are calculated in a semiclassical approach at large momentum tr ansfer Q(2) and small values of the scaling variable x. The bade proce ss is the production of a quark-antiquark pair in the colour field of the proton. The structure functions are expressed in terms of Wilson l ines along the classical trajectories of quark and antiquark passing t hrough the colour field, and their covariant derivatives. Based on som e rather general assumptions on properties of the colour held, inclusi ve and diffractive structure functions are evaluated in terms of four field dependent constants.