Mainz 2004 – scientific programme

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T: Teilchenphysik

T 107: QCD I

T 107.9: Talk

Monday, March 29, 2004, 18:00–18:15, RW 5

Dual parametrization of generalized parton distributions and DVCS data — •Vadim Guzey¹ and Maxim Polyakov² — ¹Ruhr-Universität Bochum, Universitätstr., 150 — ²Liege University, Belgium

We further develop a parametrization of generalized parton distributions (GPDs) of the proton in terms of the infinite series of t-channel exchanges (dual parametrization by Polyakov and Shuvaev). The main advantages of the model include clear physical interpretation of the parameters (Regge theory motivated), polynomiality (the so-called D-term is included) and flexibility (enables to study t-dependence of GPDs). We demonstrate that the model enables one to obtain a good description of all available DVCS data on the total cross section, beam-spin and beam-charge asymmetries. Hence, we advocate the dual model as a sound alternative to the commonly used double distribution model of GPDs.