Abstract
Due to the peculiar shape of the proton charge density ρ(r) the value of the rms-radius r rms determined from electron scattering data depends strongly on the density ρ(r) at large radii, which is not fixed by scattering data. Supplementing the data with the large-r shape of ρ(r) resulting from the Fock components (n + π, . . .) dominating the large-r behavior produces a more reliable value. This radius agrees with the one we previously extracted, but disagrees with the one recently obtained from muonic Hydrogen. The origin of the discrepancy is not understood.
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