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Beschreibung:
In the light of the new data on the various neutron and proton electromagnetic form factors taken in recent years, 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 most modern form factor data. with the exception of the Jefferson Lab data on G(E)(p)/G(M)(p) in the four-momentum transfer range Q(2) = 3. 6 GeV2. 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.