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Updated dispersion-theoretical analysis of the nucleon electromagnetic form factors

  • H.-W. HammerEmail author
  • Ulf-G Meißner
Article

Abstract.

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 \(Q^2 = 3 \ldots 6\) 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.

Keywords

Form Factor Spectral Function Good Description Charge Radius Recent Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.Helmholtz-Institut für Strahlen- und Kernhysik (Theorie)Universität BonnBonnGermany
  2. 2.Institut für Kernphysik (Theorie)Forschungszentrum JülichJülichGermany

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