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Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering

Armstrong, D. S. and Carr, R. and Covrig, S. and Hannelius, L. and Martin, J. W. and McKeown, R. D. (2007) Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering. Physical Review Letters, 99 (9). Art. No. 092301. ISSN 0031-9007.

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We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q^2=0.15, 0.25  (GeV/c)^2. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A_n provides a direct probe of the imaginary component of the 2γ exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

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Additional Information:© 2007 The American Physical Society. Received 11 May 2007; published 29 August 2007. This work is supported in part by CNRS (France), DOE (USA), NSERC (Canada), and NSF (USA). We thank A. V. Afanasev, M. Gorchtein, B. Pasquini, and M. Vanderhaeghen for their calculations and useful discussions.
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Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20170427-073540967
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76973
Deposited By: Tony Diaz
Deposited On:27 Apr 2017 16:48
Last Modified:03 Oct 2019 17:52

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