2006/05/31 by The HERMES Collaboration, Н. Акопов, A. Airapetian +98 · 4 citations
Physics and Astronomy · #Amplitude #Annihilation #Asymmetry #Azimuth #Beam (structure) #Channel (broadcasting) #Compton scattering #DESY #Electron #HERA #High-Energy Particle Collisions Research #Interference (communication) #Lepton #Nuclear physics #Optics #Particle physics #Particle physics theoretical and experimental studies #Parton #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Scattering #hep-ex
paper · pdf · doi:10.1103/physrevd.75.011103
published as Phys.Rev.D75:011103,2007
arxiv created 2006/12/21 · openalex publication_date 2007/01/26 · arxiv updated 2012/08/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.