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Browsing by Author "Vanderhaeghen, M."

Now showing 1 - 2 of 2
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    Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering
    Androic, 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.; Chao, Y. C.; 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.; Real, J. S.; Roche, J.; Roos, P.; Schaub, J.; Seva, T.; Simicevic, N.; Smith, G. R.; Spayde, D. T.; Stutzman, M.; Suleiman, R.; Tadevosyan, V.; van Oers, W. T. H.; Versteegen, M.; Voutier, E.; Vulcan, W.; Wells, S. P.; Williamson, S. E.; Wood, S. A.; Pasquini, B.; Vanderhaeghen, M.; G0 Collaboration (American Physical Society, 2011-07-05)
    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 degrees) for Q(2) = 0.22 GeV2/c(2) and 0.63 GeV2/c(2) 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 (pi N) 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.
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    Visualizing Femto-Scale Dynamics – Final Report
    Burkert, V.; Elouadrhiri, L.; Girod, F.X.; Heddle, D.; Polys, Nicholas F.; Schweitzer, P.; Vanderhaeghen, M. (2020-03-31)
    The team effort has resulted in the first-ever realistic visualization of force distribution on the quarks inside the proton in 3D views and animation. To further enhance the scientific value of this study, the difference of the original RM and of the finally extracted RM1, which is obtained after the limitations in acceptances, resolution effects, and lack of information of the complete set of Compton Form Factors are quantitatively incorporated, analyzed and visualized. As new measurements have already been conducted, the analysis of these measurements in terms of the mechanical properties should significantly reduce uncertainties, both in statistics and systematic. Here the need arises to visualize the size of the uncertainties as more experimental information becomes available.