Report/Journal Article PUBDB-2017-02187

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Measurement of the beam spin azimuthal asymmetry associated with deeply virtual Compton scattering

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2001
APS College Park, Md.

Physical review letters 87(18), 182001 () [10.1103/PhysRevLett.87.182001]
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Report No.: DESY-01-091; hep-ex/0106068

Abstract: The beam-spin asymmetry in hard electroproduction of photons has been measured for the first time. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle phi relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sin(phi) moment was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply-virtual Compton scattering processes.

Keyword(s): positron p: deep inelastic scattering ; positron: polarized beam ; polarization: longitudinal ; Compton scattering: off-shell ; photon: electroproduction ; angular distribution: asymmetry ; helicity: dependence ; analyzing power ; approximation: Bethe-Heitler ; interference ; HERMES ; experimental results ; DESY HERA Stor ; 26.7 GeV

Classification:

Note: HERMES

Contributing Institute(s):
  1. DESY Retrocat (DESY(-2012))
Research Program(s):
  1. 899 - ohne Topic (POF3-899) (POF3-899)
Experiment(s):
  1. HERA: HERMES

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Medline ; American Physical Society Transfer of Copyright Agreement ; OpenAccess ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; NationallizenzNationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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 Record created 2017-05-03, last modified 2025-08-04


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