Nuclear-mass dependence of azimuthal beam-helicity and beam-charge asymmetries in deeply virtual Compton scattering

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.035202· OSTI ID:21386709

Airapetian, A ^[1]; Akopov, N; Avakian, R; Avetissian, A; Elbakian, G; Gharibyan, V; Karyan, G; Marukyan, H; Movsisyan, A; Taroian, S ^[2]; Akopov, Z; Avetisyan, E; Borissov, A; Hartig, M; Holler, Y; Rostomyan, A; Schueler, K P; Varanda, M; Ye, Z; Zihlmann, B ^[3]

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1. Physikalisches Institut, Universitaet Giessen, D-35392 Giessen (Germany)
2. Yerevan Physics Institute, 375036 Yerevan (Armenia)
3. DESY, D-22603 Hamburg (Germany)

The nuclear-mass dependence of azimuthal cross-section asymmetries with respect to charge and longitudinal polarization of the lepton beam is studied for hard exclusive electroproduction of real photons. The observed beam-charge and beam-helicity asymmetries are attributed to the interference between the Bethe-Heitler and the deeply virtual Compton scattering processes. For various nuclei, the asymmetries are extracted for both coherent and incoherent-enriched regions, which involve different (combinations of) generalized parton distributions. For both regions, the asymmetries are compared to those for a free proton, and no nuclear-mass dependence is found.

• OSTI ID: 21386709
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BARYONS
BASIC INTERACTIONS
BEAMS
BETHE-HEITLER THEORY
BOSONS
COMPTON EFFECT
CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROPRODUCTION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HELICITY
INTERACTIONS
INTERFERENCE
LEPTON BEAMS
MASS
MASSLESS PARTICLES
NUCLEI
NUCLEONS
PARTICLE BEAMS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTONS
POLARIZATION
PROTONS
SCATTERING