, 48:151,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 06 Nov 2012

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.

Communicated by E. De Sanctis
This article is published with open access at Springerlink.com