We compute amplitude of deeply virtual Compton scattering in the parton model. We found that the amplitude up to the accuracy O(1/Q) depends on new skewed parton distributions (SPD's). These additional contributions make the DVCS amplitude explicitly transverse.

We compute the helicity skewed quark distributions H and E in the chiral quark-soliton model of the nucleon. This model emphasizes correctly the role of spontaneously broken chiral symmetry in structure of nucleon. It is based on the large-N c picture of the nucleon as a soliton of the effective chiral lagrangian and allows to calculate the leading twist quarkand antiquark distributions at a low normalization point.We discuss the role of chiral symmetry in the helicity skewed quark distributions H and E. We show that generalization of soft pion theorems, based on chiral Ward identities, leads in the region of −ξ < x < ξ to the pion pole contribution to E which dominates at small momentum transfer.

The generalization of the conformal scattering method for small-angle scattering processes involving magnetic monopoles and ordinary charges is constructed. Using this generalization we show that introducing of magnetic charges corresponds to analytical continuation of the eikonal amplitude in the complex charge plane (the imaginary part is proportional to the magnetic charge). We calculate explicitly the eikonal amplitude for scattering on a dyon and two monopoles in terms of confluent hypergeometric functions. The singularities of the corresponding amplitudes (focal points) are studied in details.⋄ DAAD fellow, on leave of absence from St. Petersburg University, St. Petersburg, Russia