2009/09/19 by The HERMES collaboration, A. Airapetian
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1088/1126-6708/2009/11/083
published as JHEP 0911:083,2009 · 21 pages, 5 Figures, and 5 Tables
arxiv created 2009/09/19 · openalex publication_date 2009/11/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
Hard exclusive leptoproduction of real photons from an unpolarized proton target is studied in an effort to elucidate generalized parton distributions. The data accumulated during the years 1996--2005 with the HERMES spectrometer are analyzed to yield asymmetries with respect to the combined dependence of the cross section on beam helicity and charge, thereby revealing previously unseparated contributions from deeply virtual Compton scattering and its interference with the Bethe--Heitler process. The integrated luminosity is sufficient to show correlated dependences on two kinematic variables, and provides the most precise determination of the dependence on only the beam charge.