Dual parameterization of generalized parton distributions and a description of DVCS data
Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780, Bochum, Germany
2 Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, 188350, Russia
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Revised: 16 December 2005
Published online: 9 March 2006
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 Q2-dependence and the W-dependence of HERA data on the total DVCS cross section and contains no free parameters in the HERA kinematics. The parameterization suits the low-xBj region especially well, which allows us to advocate it as a better alternative to the frequently used double distribution parameterization of the GPDs.
© Springer-Verlag, 2006