Fig. 3. The neutron electric form factor.

a Green diamonds: the neutron electric form factor, $G_{\mathrm{E}}^{\mathrm{n}}$, at low momentum transfers from the analysis based on the SU(6)²² and n_b determined from the world data. Red boxes: the $G_{\mathrm{E}}^{\mathrm{n}}$ results from the analysis based on the large-N_c²³. 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. ^24–28 (MAMI, JLab/Hall-A data) and the open ones to that of ref. ³¹ (CLAS data). b Blue circles: the final $G_{\mathrm{E}}^{\mathrm{n}}$ results at low momentum transfers, extracted from the weighted average of the SU(6) and the large-N_c 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 $G_{\mathrm{E}}^{\mathrm{n}}$ world data (open-circles)^7–21 are shown. The extracted $G_{\mathrm{E}}^{\mathrm{n}}$ 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.