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Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering

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arxiv 1103.3667 v3 pith:IDNGM4PI submitted 2011-03-18 nucl-ex hep-phnucl-th

The G0 Collaboration , D. Androić , D. S. Armstrong , J. Arvieux , S. L. Bailey , D. H. Beck , E. J. Beise , J. Benesch
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F. Benmokhtar L. Bimbot J. Birchall P. Bosted H. Breuer C. L. Capuano Y.-C. Chao A. Coppens C. A. Davis C. Ellis G. Flores G. Franklin C. Furget D. Gaskell M. T. W. Gericke J. Grames G. Guillard J. Hansknecht T. Horn M. K. Jones P. M. King W. Korsch S. Kox L. Lee J. Liu A. Lung J. Mammei J. W. Martin R. D. McKeown A. Micherdzinska M. Mihovilovic H. Mkrtchyan M. Muether S. A. Page V. Papavassiliou S. F. Pate 10 S. K. Phillips P. Pillot M. L. Pitt M. Poelker B. Quinn W. D. Ramsay J.-S. Real J. Roche P. Roos J. Schaub T. Seva N. Simicevic G. R. Smith D. T. Spayde M. Stutzman R. Suleiman V. Tadevosyan W. T. H. van Oers M. Versteegen E. Voutier W. Vulcan S. P. Wells S. E. Williamson S. A. Wood B. Pasquini M. Vanderhaeghen
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classification nucl-exhep-phnucl-th
keywords scatteringanglesasymmetriesasymmetrybackwardbeambeam-normalelastic
verification ladder T0 review T1 audit T2 compute T3 formal
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We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (piN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasi-static deuterium approximation, and is also in agreement with theory.

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