Deep Virtual Compton Scattering (DVCS) with the CLAS detector at Jefferson Lab, first results and future plans

Details Deep Virtual Compton Scattering (DVCS) with the CLAS detector at Jefferson Lab, first results and future plans Deep Virtual Compton Scattering (DVCS) with the CLAS detector at Jefferson Lab, first results and future plans

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri10002e&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The first results on Deeply Virtual Compton Scattering (DVCS) using CLAS electroproduction data on hydrogen with a 4.2 GeV polarized beam will be presented. The main focus of these studies is the measurement of the Beam Spin Asymmetry (BSA) in the reaction ep arrow epγ. The asymmetry arises from the interference of the DVCS and Bethe-Heitler processes. The BSA is directly proportional to the imaginary part of the DVCS amplitude, and gives access to the Generalized Parton Distributions (GPDs) H and E. Theoretical evaluation at the twist-3 level shows that the CLAS data is consistent with a significant anti-quark-gluon-quark correlation effect[1]. The Q^2 and xB dependence of magnitude of BSA will be a sensitive test for the Bjorken regime. We will also present preliminary data on the DVCS process from 6 GeV longitudinally polarized beam from the data taken this fall. A dedicated experiment to study DVCS with an optimized CLAS configuration to detect all particles in the final state using a 6 GeV polarized beam is planned for the year 2003. The goals and the detector upgrade for this experiment will be briefly discussed. 1. A. Belitsky, D. Mueller and A. Kirchner hep-ph/0112108

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