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

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....

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Veröffentlicht in:	arXiv.org 2011-06
Hauptverfasser:	The G0 Collaboration, Androić, D, Armstrong, D S, Arvieux, J, Bailey, S L, Beck, D H, Beise, E J, Benesch, J, Benmokhtar, F, Bimbot, L, Birchall, J, Bosted, P, Breuer, H, Capuano, C L, Y -C Chao, Coppens, A, Davis, C A, Ellis, C, Flores, G, Franklin, G, Furget, C, Gaskell, D, Gericke, M T W, Grames, J, Guillard, G, Hansknecht, J, Horn, T, Jones, M K, King, P M, Korsch, W, Kox, S, Lee, L, Liu, J, Lung, A, Mammei, J, Martin, J W, McKeown, R D, Micherdzinska, A, Mihovilovic, M, Mkrtchyan, H, Muether, M, Page, S A, Papavassiliou, V, Pate, S F, Phillips, S K, Pillot, P, Pitt, M L, Poelker, M, Quinn, B, Ramsay, W D, J -S Real, Roche, J, Roos, P, Schaub, J, Seva, T, Simicevic, N, Smith, G R, Spayde, D T, Stutzman, M, Suleiman, R, Tadevosyan, V, W T H van Oers, Versteegen, M, Voutier, E, Vulcan, W, Wells, S P, Williamson, S E, Wood, S A, Pasquini, B, Vanderhaeghen, M
Format:	Artikel
Sprache:	eng
Schlagworte:	Asymmetry Beams (radiation) Deuterium Elastic scattering Exchanging Physics - High Energy Physics - Phenomenology Physics - Nuclear Experiment Physics - Nuclear Theory Protons Scattering angle
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Beschreibung
Zusammenfassung:	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.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1103.3667