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      Deeply virtual Compton scattering on longitudinally polarized protons and neutrons at CLAS

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          Abstract

          This paper focuses on a measurement of deeply virtual Compton scattering (DVCS) performed at Jefferson Lab using a nearly-6-GeV polarized electron beam, two longitudinally polarized (via DNP) solid targets of protons (NH3) and deuterons (ND3) and the CEBAF Large Acceptance Spectrometer. Here, preliminary results for target-spin asymmetries and double (beam-target) asymmetries for proton DVCS, as well as a very preliminary extraction of beam-spin asymmetry for neutron DVCS, are presented and linked to Generalized Parton Distributions.

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          Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off

          Xiangdong Ji (1996)
          I introduce a gauge invariant decomposition of the nucleon spin into quark helicity, quark orbital, and gluon contributions. The total quark (and hence the quark orbital) contribution is shown to be measurable through virtual Compton scattering in a special kinematic region where single quark scattering dominates. This deeply-virtual Compton scattering (DVCS) has much potential to unravel the quark and gluon structure of the nucleon.
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            Nucleon Form Factors from Generalized Parton Distributions

            A. Radyushkin, M. Guidal, M. Polyakov … (2004)
            We discuss the links between Generalized Parton Distributions (GPDs) and elastic nucleon form factors. These links, in the form of sum rules, represent powerful constraints on parametrizations of GPDs. A Regge parametrization for GPDs at small momentum transfer, is extended to the large momentum transfer region and it is found to describe the basic features of proton and neutron electromagnetic form factor data. This parametrization is used to estimate the quark contribution to the nucleon spin.
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              Author and article information

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              Publication date Created: 13 July 2012
              Article
              ArXiV ID: 1207.3191
              SO-VID: 689c5551-dc53-41ae-b85a-c241c6000799
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              http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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              Comments 6 pages, 5 figures. Proceedings for the QNP2012 conference
              Categories nucl-ex hep-ex

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