Azimuthal asymmetries in Deeply Virtual Compton Scattering on an unpolarized proton target

TL;DR

This paper reports preliminary measurements of azimuthal asymmetries in Deeply Virtual Compton Scattering on an unpolarized proton, providing insights into the underlying nucleon structure through experimental data and comparison with theoretical models.

Contribution

It presents the first simultaneous extraction of interference and DVCS squared amplitude asymmetries using data from the HERMES experiment.

Findings

Significant asymmetry amplitudes for the first cosine moment of beam-charge asymmetry.

Significant asymmetry amplitudes for the first sine moment of beam-spin asymmetry.

Results are consistent with certain theoretical calculations.

Abstract

Preliminary results on azimuthal asymmetries in leptoproduction of real photons on an unpolarized hydrogen target measured at the HERMES experiment are presented. The analysis of data taken with different beam charges and helicities allows for a simultaneous extraction of asymmetries originating from the interference term and the squared DVCS amplitude. Sizeable asymmetry amplitudes for the first cosine moment of the beam-charge asymmetry and the first sine moment of the beam-spin asymmetry have been found. The results are compared to different theoretical calculations.