Colour dipoles and virtual Compton scattering

Abstract

An analysis of Deeply Virtual Compton Scattering (DVCS) is made within the colour dipole model. We compare and contrast two models for the dipole cross-section which have been successful in describing structure function data. Both models agree with the available cross section data on DVCS from HERA. We give predictions for various azimuthal angle asymmetries in HERA kinematics and for the DVCS cross section in the THERA region.

Published version, 27 pages, 17 figures. Several minor changes made in response to the referee's comments: discussion concerning the azimuthal angle phi and the large Q^2 limit made more precise, two figures added to compare the transverse size profiles for DVCS and DIS. Eq.(34) corrected and asymmetry figures updated

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