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Deeply virtual Compton scattering and generalized parton distributions at CLAS

Journal Article · · European Physical Journal A

The exclusive electroproduction of real photons and mesons at high momentum transfer allows us to access the Generalized Parton Distributions (GPDs). The formalism of the GPDs provides a unified description of the hadronic structure in terms of quark and gluonic degrees of freedom. In particular, the Deeply Virtual Compton Scattering (DVCS), ep â e2p2Å , is one of the key reactions to determine the GPDs experimentally, as it is the simplest process that can be described in terms of GPDs. A dedicated experiment to study DVCS has been carried out in Hall B at Jefferson Lab. Beam-spin asymmetries, resulting from the interference of the Bethe-Heitler process and DVCS have been extracted over the widest kinematic range ever accessed for this reaction ( 1.2 < Q 2 < 3.7 (GeV/c 2, 0.09 < - t < 1.3 (GeV/c 2, 0.13 < x B < 0.46 . In this paper, the results obtained experimentally are shown and compared to GPD parametrizations.

Research Organization:
Thomas Jefferson Lab National Accelerator Facility
Sponsoring Organization:
USDOE
OSTI ID:
956145
Report Number(s):
JLAB-PHY-08-879; DOE/OR/23177-0578
Journal Information:
European Physical Journal A, Journal Name: European Physical Journal A Vol. 38
Country of Publication:
United States
Language:
English

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