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

Androić, Darko and Armstrong, D. S. and Arvieux, J. and Bailey, S. L. and Beck, D. H. and Beise, E. J. and Benesch, J. and Benmokhtar, F. and Bimbot, L. and Birchall, J. and Bosted, P. and Breuer, H. and Capuano, C. L. and Chao, Y.-C. and Coppens, A. and Davis, C. A. and Ellis, C. and Flores, G. and Franklin, G. and Furget, C. and Gaskell, D. and Gericke, M. T. W. and Grames, J. and Guillard, G. and Hansknecht, J. and Horn, T. and Jones, M. K. and King, P. M. and Korsch, W. and Kox, S. and Lee, L. and Liu, J. and Lung, A. and Mammei, J. and Martin, J. W. and McKeown, R. D. and Micherdzinska, A. and Mihovilovic, M. and Mkrtchyan, H. and Muether, M. and Page, S. A. and Papavassiliou, V. and Pate, S. F. and Phillips, S. K. and Pillot, P. and Pitt, M. L. and Poelker, M. and Quinn, B. and Ramsay, W. D. and Real, J.-S. and Roche, J. and Roos, P. and Schaub, J. and Ševa, Tomislav and Šimičević, Neven and Smith, G. R. and Spayde, D. T. and Stutzman, M. and Suleiman, R. and Tadevosyan, V. and van Oers, W. T. H. and Versteegen, M. and Voutier, E. and Vulcan, W. and Wells, S. P. and Williamson, S. E. and Wood, S. A. and Pasquini, B. and Vanderhaeghen, M. (G0 Collaboration) (2011) Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering. Physical Review Letters, 107 (2). pp. 22501-5. ISSN 0031-9007

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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 quasielastic scattering on the deuteron, at backward angles (lab scattering angle of 108°) for Q2=0.22  GeV2/c2 and 0.63  GeV2/c2 at beam energies of 362 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 (πN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasistatic deuterium approximation, and is also in agreement with theory.

Item Type: Article
Keywords: parity-violating asymmetries, axial-vector current, strange quark, charge and magnetic nucleon form factors
Date: July 2011
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2011) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 Jun 2014 12:45
Last Modified: 24 Feb 2016 15:13

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