2002/07/11 by F. Ellinghaus · 35 citations
Physics and Astronomy · #Amplitude #Annihilation #Asymmetry #Beam (structure) #Charge (physics) #Compton scattering #DESY #Electron #HERA #High-Energy Particle Collisions Research #Lepton #Nuclear physics #Optics #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Parton #Photon #Physics #Quantum chromodynamics #Scattering #hep-ex
paper · pdf · doi:10.1016/s0375-9474(02)01210-1
published in Nuclear Physics A 711(1-4), 171-174 (Elsevier BV) · 4 pages, 2 figures. Contribution to the European Workshop on the QCD Structure of the Nucleon (QCD - N'02), Ferrara, Italy, 3-6 Apr 2002, to be published in Nucl. Phys. A
arxiv created 2002/07/11 · openalex publication_date 2002/12/01 · arxiv updated 2017/08/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report the first observation of an azimuthal asymmetry in the hard electroproduction of real photons with respect to the charge of the incoming lepton beam. The asymmetry is attributed to the interference between the Bethe-Heitler process and the deeply-virtual Compton scattering process, which gives access to the latter at the amplitude level. This process appears to be the theoretically cleanest way to access generalized parton distributions. The data have been accumulated by the HERMES experiment at DESY, scattering the HERA 27.6 GeV electron/positron beam off an unpolarized hydrogen gas target.