2006/07/10 by V. Guzey, T. Teckentrup · 45 citations
Mathematics · Physics and Astronomy · #Discrete mathematics #Distribution (mathematics) #High-Energy Particle Collisions Research #Mathematical analysis #Mathematics #Parametrization (atmospheric modeling) #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ph
paper · pdf · doi:10.1103/physrevd.74.054027
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 74(5) (American Physical Society) · 33 pages, 11 figures
arxiv created 2006/07/10 · openalex publication_date 2006/09/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We develop the minimal model of a new leading order parametrization of generalized parton distributions (GPDs) introduced by Polyakov and Shuvaev. 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 primarily for small and medium-size values of xB, xB\ensuremath≤0.2. We examine two different models of the t dependence of the GPDs: the factorized exponential model and the nonfactorized Regge-motivated model. Using our model, we successfully described the deeply virtual Compton scattering (DVCS) cross section measured by H1 and ZEUS, the moments of the beam-spin ALU^sin\ensuremathφ, the beam-charge AC^cos\ensuremathφ, and the transversely polarized target AUT^sin\ensuremathφcos\ensuremathφ DVCS asymmetries measured by HERMES and ALU^sin\ensuremathφ measured by CLAS. The data on AC^cos\ensuremathφ prefer the Regge-motivated model of the t dependence of the GPDs. The data on AUT^sin\ensuremathφcos\ensuremathφ indicate that the u and d quarks carry only a small fraction of the proton total angular momentum.