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

Abstract : 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 Q^2 = 0.22 GeV^2/c^2 and 0.63GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. 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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http://hal.in2p3.fr/in2p3-00578541
Contributor : Emmanuelle Vernay <>
Submitted on : Monday, March 21, 2011 - 2:12:25 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:31 PM

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D. Androic, D.S. Armstrong, J. Arvieux, S.L. Bailey, D.H. Beck, et al.. Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering. Physical Review Letters, American Physical Society, 2011, 107, pp.022501. ⟨10.1103/PhysRevLett.107.022501⟩. ⟨in2p3-00578541⟩

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