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Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering

Airapetian, A. and Filippone, B. W. and McIlhany, K. and Tipton, B. (2001) Measurement of the Beam-Spin Azimuthal Asymmetry Associated with Deeply-Virtual Compton Scattering. Physical Review Letters, 87 (18). Art. No. 182001. ISSN 0031-9007. doi:10.1103/PhysRevLett.87.182001.

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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.

Item Type:Article
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Filippone, B. W.0000-0002-2618-2688
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.
Issue or Number:18
Classification Code:PACS: 13.60.Fz, 14.20.Dh, 24.85.+p
Record Number:CaltechAUTHORS:20111003-142718798
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25529
Deposited By: Tony Diaz
Deposited On:05 Oct 2011 16:13
Last Modified:09 Nov 2021 16:34

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