arXiv:hep-ph/0006321·v2·High Energy Physics — Phenomenology
DVCS amplitude in the parton model
M. Penttinen🇩🇪 · M.V. Polyakov🇩🇪 · A.G.Shuvaev🇷🇺 · M. Strikman🇺🇸
Abstract
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.
Comments: New spin sum rules for twist-3 SPD's are added. Discussion of 1/Q behaviour of twist-3 contributions is corrected