2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/207525We 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.New spin sum rules for twist-3 SPD's are added. Discussion of 1/Q behaviour of twist-3 contributions is correctedHigh Energy Physics - Phenomenologytext