Transverse beam spin asymmetries in forward-angle elastic electron-proton scattering

D. S. Armstrong, J. Arvieux, R. Asaturyan, T. Averett, S. L. Bailey, G. Batigne, D. H. Beck, E. J. Beise, J. Benesch, L. Bimbot, J. Birchall, A. Biselli, P. Bosted, E. Boukobza, H. Breuer, R. Carlini, R. Carr, N. Chant, Y. C. Chao, S. ChattopadhyayR. Clark, S. Covrig, A. Cowley, D. Dale, C. Davis, W. Falk, J. M. Finn, T. Forest, G. Franklin, C. Furget, D. Gaskell, J. Grames, K. A. Griffioen, K. Grimm, B. Guillon, H. Guler, L. Hannelius, R. Hasty, A. Hawthorne Allen, T. Horn, K. Johnston, M. Jones, P. Kammel, R. Kazimi, P. M. King, A. Kolarkar, E. Korkmaz, W. Korsch, S. Kox, J. Kuhn, J. Lachniet, L. Lee, J. Lenoble, E. Liatard, J. Liu, B. Loupias, A. Lung, D. Marchand, J. W. Martin, K. W. McFarlane, D. W. McKee, R. D. McKeown, F. Merchez, H. Mkrtchyan, B. Moffit, M. Morlet, I. Nakagawa, K. Nakahara, R. Neveling, S. Ong, S. Page, V. Papavassiliou, S. F. Pate, S. K. Phillips, M. L. Pitt, M. Poelker, T. A. Porcelli, G. Quéméner, B. Quinn, W. D. Ramsay, A. W. Rauf, J. S. Real, J. Roche, P. Roos, G. A. Rutledge, J. Secrest, N. Simicevic, G. R. Smith, D. T. Spayde, S. Stepanyan, M. Stutzman, V. Sulkosky, V. Tadevosyan, R. Tieulent, J. Van De Wiele, W. T.H. Van Oers, E. Voutier, W. Vulcan, G. Warren, S. P. Wells, S. E. Williamson, S. A. Wood, C. Yan, J. Yun, V. Zeps

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36 Scopus citations


We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q2=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. An 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.

Original languageEnglish
Article number092301
JournalPhysical Review Letters
Issue number9
StatePublished - Aug 29 2007

ASJC Scopus subject areas

  • General Physics and Astronomy


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