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

doi:10.1016/s0370-2693(01)00231-3

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Compton Scattering by the Proton

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Abstract

Compton scattering by the proton has been measured over a wide range covering photon energies 250 MeV < E_γ< 800 MeV and photon scattering angles 30^0 < θ^{lab}_γ< 150^0, 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 \pm 0.4(stat+syst) \pm 0.2(model)%. From all data below 455 MeV the proton's backward spin polarizability was determined to be γ_π=(-37.9 \pm 0.6(stat+syst) \pm 3.5(model))x10^{-4}fm^4.

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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. 2001-02-06. Compton Scattering by the Proton. https://doi.org/10.1016/s0370-2693(01)00231-3

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