Fig. 3: The neutron electric form factor.
From: Measurement of the neutron charge radius and the role of its constituents
a Green diamonds: the neutron electric form factor, \({G}_{{\rm{E}}}^{{\rm{n}}}\), at low momentum transfers from the analysis based on the SU(6)22 and nb determined from the world data. Red boxes: the \({G}_{{\rm{E}}}^{{\rm{n}}}\) results from the analysis based on the large-Nc23. The fit to the data from the parametrization of Eq. (5) is shown with the dashed and the solid curves, respectively. The filled symbols (diamonds/boxes) correspond to the analysis of the data from ref. 24,25,26,27,28 (MAMI, JLab/Hall-A data) and the open ones to that of ref. 31 (CLAS data). b Blue circles: the final \({G}_{{\rm{E}}}^{{\rm{n}}}\) results at low momentum transfers, extracted from the weighted average of the SU(6) and the large-Nc analysis results. The variance of the two data sets is quantified as a theoretical uncertainty. The solid curve shows the fit to the data from the parametrization of Eq. (5), with its uncertainty (shaded band). The \({G}_{{\rm{E}}}^{{\rm{n}}}\) world data (open-circles)7,8,9,10,11,12,13,14,15,16,17,18,19,20,21 are shown. The extracted \({G}_{{\rm{E}}}^{{\rm{n}}}\) from the analysis of the CLAS measurements31 at intermediate momentum transfers is also shown (green boxes). The error bars correspond to the total uncertainty, at the 1σ or 68% confidence level.
