DVCS amplitude in the parton model

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.

New spin sum rules for twist-3 SPD's are added. Discussion of 1/Q behaviour of twist-3 contributions is corrected

References in corpus (2)

• Helicity skewed quark distributions of the nucleon and chiral symmetry
• On the Structure of the Virtual Compton Amplitude in the Generalized Bjorken Region: Integral Relations

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