Updated dispersion-theoretical analysis of the nucleon electromagnetic form factor

Hammer, H.-W.; Meissner, U.G.

doi:10.1140/epja/i2003-10223-y

Journal Article

PreJuSER-43542

Updated dispersion-theoretical analysis of the nucleon electromagnetic form factor

Hammer, H.-W. ; Meissner, U. G.FZJ*

2004
Springer Berlin

The European physical journal / A 20, 469 - 473 (2004) [10.1140/epja/i2003-10223-y]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10685 doi:10.1140/epja/i2003-10223-y

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... 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.

Keyword(s): nucleon: form factor ; dispersion ; spectral representation: parametrization ; unitarity ; quantum chromodynamics: perturbation theory ; momentum transfer ; numerical calculations: interpretation of experiments

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Note: Record converted from VDB: 12.11.2012; 5 pages, 3 ps figures, final version, exp. errors in Figs. 1 and 3 corrected Report-no: HISKP-TH-03/24 Journal-ref: Eur. Phys. J. A 20, 469-473 (2004) DOI: 10.1140/epja/i2003-10223-y

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