Dual parameterization of generalized parton distributions and description of DVCS data

Details Dual parameterization of generalized parton distributions and description of DVCS data Dual parameterization of generalized parton distributions and description of DVCS data

2005-07-15

arxiv.org/abs/hep-ph/0507183v2

Eur.Phys.J.C46:151-156,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 2 figures, LaTeX. Revised version: equation for the DVCS cross section corrected; one reference added; numerical res

Scientific paper

10.1140/epjc/s2006-02491-0

We discuss a new leading-order parameterization of generalized parton distributions of the proton, which is based on the idea of duality. In its minimal version, the parameterization is defined by the usual quark singlet parton distributions and the form factors of the energy-momentum tensor. We demonstrate that our parameterization describes very well the absolute value, the Q^2-dependence and the W-dependence of the HERA data on the total DVCS cross section and contains no free parameters in that kinematics. The parameterization suits especially well the low-x_{Bj} region, which allows us to advocate it as a better alternative to the frequently used double distribution parameterization of the GPDs.

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