https://doi.org/10.1140/epja/i2008-10653-y
Regular Article - Experimental Physics
Deeply virtual Compton scattering and generalized parton distributions at CLAS⋆
IPN, Orsay, France
* e-mail: silvia@jlab.org
Received:
28
March
2008
Revised:
2
September
2008
Accepted:
18
September
2008
Published online:
10
November
2008
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 → e′p′γ , 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.
PACS: 13.40.Gp Electromagnetic form factors – / 13.60.Fz Elastic and Compton scattering – / 13.60.Hb Total and inclusive cross-sections (including deep-inelastic processes) –
© SIF, Springer-Verlag Berlin Heidelberg, 2008
