Deeply virtual Compton Scattering cross section measured with CLAS

Conference · Mon Sep 01 00:00:00 EDT 2014 · Proceedings of Science

OSTI ID:1168661

Guegan, Baptistse ^[1]

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1. Institut de Physique Nucleaire, Orsay

The Generalized Parton Distributions (GPDs) provide a new description of nucleon structure in terms of its elementary constituents, the quarks and the gluons. Including and extending the information provided by the form factors and the parton distribution functions, they describe the correlation between the transverse position and the longitudinal momentum fraction of the partons in the nucleon. Deeply Virtual Compton Scattering (DVCS), the electroproduction of a real photon on a single quark in the nucleon eN --> e'N'g, is the exclusive process most directly interpretable in terms of GPDs. A dedicated experiment to study DVCS with the CLAS detector at Jefferson Lab has been carried out using a 5.9-GeV polarized electron beam and an unpolarized hydrogen target, allowing us to collect DVCS events in the widest kinematic range ever explored in the valence region : 1.0 < Q2 < 4.6 GeV2, 0.1 < xB < 0.58 and 0.09 < -t < 2.0 GeV2. In this paper, we show preliminary results of unpolarized cross sections and of polarized cross section differences for the DVCS channel.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1168661
• Report Number(s): JLAB-PHY-13-1843; DOE/OR/23177-3064
• Journal Information: Proceedings of Science, Vol. HADRON13; Conference: Hadron 2013, 4-8 November 2013, Nara, Japan
• Country of Publication: United States
• Language: English