The size of the proton: Closing in on the radius puzzle

We analyze the recent electron-proton scattering data from Mainz using a dispersive framework that respects the constraints from analyticity and unitarity on the nucleon structure. We also perform a continued fraction analysis of these data. We find a small electric proton charge radius, r(E)(p) = 0.84(-0.01)(+0.01) fm, consistent with the recent determination from muonic hydrogen measurements and earlier dispersive analyses. We also extract the proton magnetic radius, r(M)(p) = 0.86(-0.03)(+0.02) fm, consistent with earlier determinations based on dispersion relations.