Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors

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  • 5 December 2003
Abstract
In the light of new data on the various neutron and proton electromagnetic form factors, we update the dispersion-theoretical analysis of the nucleon electromagnetic form factors from the mid-nineties. The parametrization of the spectral functions includes constraints from unitarity, perturbative QCD, and recent measurements of the neutron charge radius. We obtain a good description of the new polarization data for the neutron form factors. For the magnetic radii of the proton and the neutron we find r_M^p = 0.857 fm and r_M^n = 0.879 fm, which is consistent with the recent determinations using continued fraction expansions.

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