Published October 29, 2001
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Journal Article
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Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering
Abstract
The beam-spin asymmetry in hard electroproduction of photons has been measured. 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 φ 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 sinφ 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.
Additional Information
© 2001 The American Physical Society. Received 18 June 2001; published 10 October 2001. We gratefully acknowledge the DESY management for its support, the staffs at DESY and the collaborating institutions for their significant effort, and our funding agencies for financial support.Attached Files
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- CaltechAUTHORS:20111003-142718798
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