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28 March 2024
 
  » arxiv » nucl-ex/0102003

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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 ;
Date 6 Feb 2001
Journal Phys.Lett. B503 (2001) 245-255
Subject nucl-ex hep-ph
AbstractCompton scattering by the proton has been measured over a wide range covering photon energies 250 MeV < E_gamma < 800 MeV and photon scattering angles 30^0 < heta^{lab}_gamma < 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 gamma_pi=(-37.9 pm 0.6(stat+syst) pm 3.5(model))x10^{-4}fm^4.
Source arXiv, nucl-ex/0102003
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