The dual parameterization of the proton generalized parton distribution functions H and E and description of the DVCS cross sections and asymmetries

Details The dual parameterization of the proton generalized parton distribution functions H and E and description of the DVCS cross sections and asymmetries The dual parameterization of the proton generalized parton distribution functions H and E and description of the DVCS cross sections and asymmetries

2006-07-10

arxiv.org/abs/hep-ph/0607099v1

Phys.Rev. D74 (2006) 054027

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages, 11 figures

Scientific paper

10.1103/PhysRevD.74.054027

We develop the minimal model of a new leading order parameterization of GPDs introduced by Shuvaev and Polyakov. The model for GPDs H and E is formulated in terms of the forward quark distributions, the Gegenbauer moments of the D-term and the forward limit of the GPD E. The model is designed primarely for small and medium-size values of x_B, x_B \leq 0.2. We examined two different models of the t-dependence of the GPDs: The factorized exponential model and the non-factorized Regge-motivated model. Using our model, we successfully described the DVCS cross section measured by H1 and ZEUS, the moments of the beam-spin A_{LU}^{\sin \phi}, beam-charge A_{C}^{\cos \phi} and transversely-polarized target A_{UT}^{\sin \phi \cos \phi} DVCS asymmetries measured by HERMES and A_{LU}^{\sin \phi} measured by CLAS. The data on A_{C}^{\cos \phi} prefers the Regge-motivated model of the t-dependence of the GPDs. The data on A_{UT}^{\sin \phi \cos \phi} indicates that the u and d quarks carry only a small fraction of the proton total angular momentum.

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