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

The elastic electron–proton scattering data are analysed in order to determine proton charge and magnetic rms radii, rE and rM. 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 and . The cross-section data were corrected for two-photon exchange. We found that without such corrections obtained rE and rM are somewhat smaller while the quality of fit is worse.