2009/07/15 by A. Airapetian, HERMES Collaboration, Н. Акопов +98 · 54 citations
Mathematics · Physics and Astronomy · #Asymmetry #Azimuth #Geometry #High-Energy Particle Collisions Research #Mathematics #Meson #Nuclear physics #Optics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Polarization (electrochemistry) #Quantum Chromodynamics and Particle Interactions #Scaling #Virtual particle #hep-ex
paper · pdf · open access · doi:10.1016/j.physletb.2009.11.039
published in Physics Letters B 682(4-5), 345-350 (Elsevier BV) · 7 pages, 2 figures
arxiv created 2009/07/15 · openalex publication_date 2009/11/20 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Exclusive electroproduction of π+ mesons was studied by scattering 27.6 GeV positrons or electrons off a transversely polarized hydrogen target. The single-spin azimuthal asymmetry with respect to target polarization was measured as a function of the Mandelstam variable t, the Bjorken scaling variable xB, and the virtuality Q2 of the exchanged photon. The extracted Fourier components of the asymmetry were found to be consistent with zero, except one that was found to be large and that involves interference of contributions from longitudinal and transverse virtual photons.