Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors

Details Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors

2003-12-05

arxiv.org/abs/hep-ph/0312081v3

Eur.Phys.J. A20 (2004) 469-473

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 ps figures, final version, exp. errors in Figs. 1 and 3 corrected

Scientific paper

10.1140/epja/i2003-10223-y

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 GeV^2. 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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