Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 24: Electromagnetic and Hadronic Probes III

HK 24.7: Vortrag

Mittwoch, 10. März 2004, 12:30–12:45, B

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

We further develop a parametrization of generalized parton distributions (GPDs) in terms of the infinite series of t-channel exchanges (the dual model by Polyakov and Shuvaev). The main advantages of the model include: clear physical interpretation of the model parameters(motivated by the Regge theory), polynomiality (the so-called D-term is present), flexibility (possibility to study t-dependence of GPDs). We demonstrate that with the dual model of GPDs one is able 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 parametrization of GPDs as a sound alternative to the commonly used double distribution model.