# On Nucleon Electromagnetic Form Factors

31 pages

### Abstract

A Poincaré-covariant Faddeev equation, which describes baryons as composites of confined-quarks and -nonpointlike-diquarks, is solved to obtain masses and Faddeev amplitudes for the nucleon and Δ. The amplitudes are a component of a nucleon-photon vertex that automatically fulfills the Ward-Takahashi identity for on-shell nucleons. These elements are sufficient for the calculation of a quark core contribution to the nucleons’ electromagnetic form factors. An accurate description of the static properties is not possible with the core alone but the error is uniformly reduced by the incorporation of meson-loop contributions. Such contributions to form factors are noticeable for Q 2 ≲ 2 GeV 2 but vanish with increasing momentum transfer. Hence, larger Q 2 experiments probe the quark core. The calculated behaviour of G E p ( Q 2 )/ G M p ( Q 2 ) on Q 2 ∈ (2,6) GeV 2 agrees with that inferred from polarization transfer data. Moreover, $\sqrt{Q^2} F_2(Q^2)/F_1(Q^2)\hskip-1pt\approx$ constant on this domain. These outcomes result from correlations in the proton’s amplitude.

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### Article Details

Title
On Nucleon Electromagnetic Form Factors
Author(s)
R., Alkofer; A., Höll; M., Kloker; A., Krassnigg; C. D., Roberts
Journal
Few-Body Systems , Volume 37 (1) Springer Journals – Jul 1, 2005
Publisher
Springer-Verlag
Subject
Physics; Elementary Particles and Nuclei; Nuclear Physics, Heavy Ions, Hadrons; Atoms, Molecules, Clusters and Plasmas
ISSN
0177-7963
eISSN
1432-5411
D.O.I.
10.1007/s00601-005-0110-6
Publisher site
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