Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-01-13
J.Phys.Conf.Ser.299:012006,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 16 figures; References added
Scientific paper
10.1088/1742-6596/299/1/012006
The goal of the comprehensive program in Deeply Virtual Exclusive Scattering at Jefferson Laboratory is to create transverse spatial images of quarks and gluons as a function of their longitudinal momentum fraction in the proton, the neutron, and in nuclei. These functions are the Generalized Parton Distributions (GPDs) of the target nucleus. Cross section measurements of the Deeply Virtual Compton Scattering (DVCS) reaction {ep -> ep \gamma} in Hall A support the QCD factorization of the scattering amplitude for Q^2 > 2 GeV^2. Quasi-free neutron-DVCS measurements on the Deuteron indicate sensitivity to the quark angular momentum sum rule. Fully exclusive H(e,e' p\gamma) measurements have been made in a wide kinematic range in CLAS with polarized beam, and with both unpolarized and longitudinally polarized targets. Existing models are qualitatively consistent with the JLab data, but there is a clear need for less constrained models. Deeply virtual vector meson production is studied in CLAS. The 12 GeV upgrade will be essential for these channels. The {\rho} and {\omega} channels reactions offer the prospect of flavor sensitivity to the quark GPDs, while the {\phi}-production channel is dominated by the gluon distribution.
Guidal Michel
Hyde Charles E.
Radyushkin Anatoly V.
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