Proton charge and magnetic rms radii from the elastic $ep$ scattering data

Details Proton charge and magnetic rms radii from the elastic $ep$ scattering data Proton charge and magnetic rms radii from the elastic $ep$ scattering data

2009-11-20

arxiv.org/abs/0911.4091v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 4 figures. Numbers slightly changed due to discovered error in minimization program. Sec.III revised, discussion of G

Scientific paper

The elastic electron-proton scattering data are analysed in order to determine proton charge and magnetic rms radii, r_E and r_M. Along with the usual statistical error, we try to estimate a systematic error in the radii, caused by the inadequacy of particular form factor parameterization employed. The range of data to use in the analysis is chosen so as to minimize the total (statistical + systematic) error. We obtain r_E = 0.912 +- 0.009 (stat) +- 0.007 (syst) fm, and r_M = 0.876 +- 0.010 (stat) +- 0.016 (syst) fm. The cross-section data were corrected for two-photon exchange. We found that without such corrections obtained r_E and r_M are somewhat smaller while the quality of fit is worse.

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