QCD evolution and skewedness effectsin color dipole description of DVCS
IIHE - CP 230, Université Libre de Bruxelles, 1050, Brussels, Belgium
2 Instituto de Física e Matemática, Universidade Federal de Pelotas, Caixa Postal 354, CEP 96010-090, Pelotas, Brazil
3 High Energy Physics Phenomenology Group, GFPAE, IF-UFRGS, Caixa Postal 15051, CEP 91501-970, Porto Alegre, Brazil
4 CERN Theory Division, 1211, Genéve 23, Switzerland
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We show the role played by QCD evolution and skewedness effects in the DVCS cross section at large Q 2 within the color dipole description of the process at photon level. The dipole cross section is given by the saturation model, which can be improved by DGLAP evolution at high photon virtualities. We investigate both possibilities as well as the off-forward effect through a simple phenomenological parameterization. The results are compared to the recent ZEUS DVCS data.
© Springer-Verlag Berlin/Heidelberg, 2004