Compton Scattering by the Proton
Abstract
Compton 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 < \theta^{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.
Cite
@article{arxiv.nucl-ex/0102003,
title = {Compton Scattering by the Proton},
author = {G. Galler and V. Lisin and R. Kondratiev and A. M. Massone and S. Wolf and J. Ahrens and H. -J. Arends and R. Beck and M. Camen and G. P. Capitani and P. Grabmayr and S. J. Hall and F. Härter and T. Hehl and P. Jennewein and K. Kossert and A. I. L'vov and C. Molinari and P. Ottonello and J. Peise and I. Preobrajenski and S. Proff and A. Robbiano and M. Sanzone and M. Schumacher and M. Schmitz and F. Wissmann},
journal= {arXiv preprint arXiv:nucl-ex/0102003},
year = {2013}
}