Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering

TL;DR

This paper reports the first measurement of beam-spin azimuthal asymmetry in deeply-virtual Compton scattering, using polarized positron beams at DESY, revealing interference effects between Bethe-Heitler and DVCS processes.

Contribution

It presents the first experimental measurement of beam-spin asymmetry in DVCS, providing new insights into the interference phenomena in photon electroproduction.

Findings

Measured asymmetry in azimuthal photon distribution: -0.23 +/- 0.04 (stat) +/- 0.03 (syst)

Asymmetry attributed to interference between Bethe-Heitler and DVCS processes

Data collected with polarized positron beam at 27.6 GeV at DESY

Abstract

The beam-spin asymmetry in hard electroproduction of photons has been measured for the first time. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle phi relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sin(phi) moment was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply-virtual Compton scattering processes.