The Beam--Charge Azimuthal Asymmetry and Deeply Virtual Compton Scattering
The HERMES Collaboration: A. Airapetian, et al
TL;DR
This paper reports the first observation of a charge-dependent azimuthal asymmetry in exclusive real photon electroproduction, providing insights into the interference between Bethe-Heitler and DVCS processes and access to Generalized Parton Distributions.
Contribution
It presents the first measurement of a lepton charge asymmetry in DVCS, revealing interference effects and advancing understanding of nucleon structure.
Findings
Observed a non-zero azimuthal asymmetry related to lepton charge.
Demonstrated interference between Bethe-Heitler and DVCS processes.
Provided experimental access to Generalized Parton Distributions.
Abstract
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.
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