Separation of contributions from deeply virtual Compton scattering and its interference with the Bethe--Heitler process in measurements on a hydrogen target

Abstract

Hard exclusive leptoproduction of real photons from an unpolarized proton target is studied in an effort to elucidate generalized parton distributions. The data accumulated during the years 1996--2005 with the HERMES spectrometer are analyzed to yield asymmetries with respect to the combined dependence of the cross section on beam helicity and charge, thereby revealing previously unseparated contributions from deeply virtual Compton scattering and its interference with the Bethe--Heitler process. The integrated luminosity is sufficient to show correlated dependences on two kinematic variables, and provides the most precise determination of the dependence on only the beam charge.

21 pages, 5 Figures, and 5 Tables

References in corpus (8)

• Deeply virtual Compton scattering at small x_B and the access to the GPD H
• Towards a fitting procedure for deeply virtual Compton scattering at next-to-leading order and beyond
• Measurement of Azimuthal Asymmetries With Respect To Both Beam Charge and Transverse Target Polarization in Exclusive Electroproduction of Real Photons
• A fitter code for Deep Virtual Compton Scattering and Generalized Parton Distributions
• Generalized Parton Distributions from Deeply Virtual Compton Scattering at HERMES
• The dual parameterization of the proton generalized parton distribution functions H and E and description of the DVCS cross sections and asymmetries
• Extraction of the Compton Form Factor H from DVCS measurements at Jefferson Lab
• On the mistake in the implementation of the minimal model of the dual parameterization and resulting inability to describe the high-energy DVCS data

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