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Published August 31, 2007 | Submitted + Published
Journal Article Open

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


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.

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.

Attached Files

Published - PhysRevLett.99.092301.pdf

Submitted - 0705.1525.pdf


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