Generalized parton distributions: Status and perspectives

Details Generalized parton distributions: Status and perspectives Generalized parton distributions: Status and perspectives

2009-02-12

arxiv.org/abs/0902.2018v1

AIP Conf.Proc.1149:150-160,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 6 figures. Proceedings of SPIN2008, University of Virginia, October 6-11, 2008

Scientific paper

10.1063/1.3215623

We summarize recent developments in understanding the concept of generalized parton distributions (GPDs), its relation to nucleon structure, and its application to high-Q2 electroproduction processes. Following a brief review of QCD factorization and transverse nucleon structure, we discuss (a) new theoretical methods for the analysis of deeply-virtual Compton scattering (t-channel-based GPD parametrizations, dispersion relations); (b) the phenomenology of hard exclusive meson production (experimental tests of dominance of small-size configurations, model-independent comparative studies); (c) the role of GPDs in small-x physics and pp scattering (QCD dipole model, central exclusive diffraction). We emphasize the usefulness of the transverse spatial (or impact parameter) representation for both understanding the reaction mechanism in hard exclusive processes and visualizing the physical content of the GPDs.

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