Beam-Charge Asymmetry associated with DVCS at HERMES

Details Beam-Charge Asymmetry associated with DVCS at HERMES Beam-Charge Asymmetry associated with DVCS at HERMES

2002-07-09

arxiv.org/abs/hep-ex/0207029v2

Nucl.Phys. A711 (2002) 171-174

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 2 figures. Contribution to the European Workshop on the QCD Structure of the Nucleon (QCD - N'02), Ferrara, Italy, 3-

Scientific paper

We report the first observation of an azimuthal asymmetry in the hard electroproduction of real photons with respect to the charge of the incoming lepton beam. The asymmetry is attributed to the interference between the Bethe-Heitler process and the deeply-virtual Compton scattering process, which gives access to the latter at the amplitude level. This process appears to be the theoretically cleanest way to access generalized parton distributions. The data have been accumulated by the HERMES experiment at DESY, scattering the HERA 27.6 GeV electron/positron beam off an unpolarized hydrogen gas target.

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