Reply to “Comment on ‘Nonidentical protons’ ”

We reply to the Comment by Downie et al., which concerns the proton radius extracted from elastic electron-proton scattering data by using the assumption of nonidentical protons.

Figure 1

Log-normal representations of Fig. 5 of Ref. [1] in a wider $Q^2$ range. Panel (a) shows a comparison between the root-mean square of the proton form factor $G_{E,p}\left(Q^2\right)$ obtained from different models [1, 4] and the experimental data [2, 5]. Panel (b) displays the same result as in panel (a) but in terms of the ratio between the form factors and the standard dipole form factor $G_{\mathrm{dip}.}\left(Q^2\right)={(1+Q^2/0.71)}^{-2}$. The deviation of these form factors and the experimental data from the standard dipole form factor is exhibited in panel (c).

Figure 2

The same as Fig. 1, but for the comparison of experimental data with different parametrizations of the “pure” dipole form factor ${(1+Q^2/{\Lambda }^2)}^{-2}$. The values of ${\Lambda }^2$ for the corresponding lines are shown in the figure. The solid line corresponds to the averaged dipole form factor with $\Delta =21.5\%$ [1] as in Fig. 1.