Beam-charge azimuthal asymmetry and deeply virtual Compton scattering

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.011103· OSTI ID:20933190

Airapetian, A; Deconinck, W; Lorenzon, W ^[1]; Akopov, N; Akopov, Z; Avakian, R; Avetissian, A; Elbakian, G; Gharibyan, V; Marukyan, H; Rostomyan, A; Taroian, S ^[2]; Amarian, M ^[3]; Andrus, A; Bailey, P; Bouwhuis, M; Linden-Levy, L A; Makins, N C. R.; Rubin, J ^[4]; Aschenauer, E C ^[3]

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1. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040 (United States)
2. Yerevan Physics Institute, 375036 Yerevan (Armenia)
3. DESY, 15738 Zeuthen (Germany)
4. Department of Physics, University of Illinois, Urbana, Illinois 61801-3080 (United States)

The first observation of an azimuthal cross section asymmetry with respect to the charge of the incoming lepton beam is reported from a study of hard exclusive electroproduction of real photons. The data have been accumulated by the HERMES experiment at DESY, in which the HERA 27.6 GeV electron or positron beam scattered off an unpolarized hydrogen gas target. The observed asymmetry is attributed to the interference between the Bethe-Heitler process and the deeply virtual Compton scattering (DVCS) process. The interference term is sensitive to DVCS amplitudes, which provide the most direct access to generalized parton distributions.

• OSTI ID: 20933190
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
COMPTON EFFECT
CROSS SECTIONS
DESY
ELECTRON BEAMS
ELECTROPRODUCTION
GEV RANGE 10-100
HERA STORAGE RING
HYDROGEN
INTERFERENCE
PHOTONS
POSITRON BEAMS