Compton Scattering by the Proton
G. Galler, V. Lisin, R. Kondratiev, A. M. Massone, S. Wolf, J. Ahrens, H. -J. Arends, R. Beck, M. Camen, G. P. Capitani, P. Grabmayr, S. J. Hall, F. Härter, T. Hehl, P. Jennewein, K. Kossert, A. I. L'vov, C. Molinari, P. Ottonello, J. Peise, I. Preobrajenski, S. Proff, A. Robbiano, M. Sanzone, M. Schumacher, M. Schmitz, F. Wissmann
Abstract
Compton scattering by the proton has been measured over a wide range covering photon energies 250 MeV < Eγ< 800 MeV and photon scattering angles 300 < θlabγ< 1500, using the tagged-photon facility at MAMI (Mainz) and the large-acceptance arrangement LARA. The data are in good agreement with the dispersion theory based on the SAID-SM99K parameterization of photo-meson amplitudes. From the subset of data between 280 and 360 MeV the resonance pion-photoproduction amplitudes were evaluated leading to the multipole E2/M1 ratio EMR(340 MeV) =(-1.6 0.4(stat+syst) 0.2(model)%. From all data below 455 MeV the proton's backward spin polarizability was determined to be γπ=(-37.9 0.6(stat+syst) 3.5(model))x10-4fm4.
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