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26 April 2024
 
  » arxiv » hep-ph/0204178

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Nucleon form factors from a covariant quark core: limits in their description
M. Oettel ; R. Alkofer ;
Date 16 Apr 2002
Journal Eur.Phys.J. A16 (2003) 95-109
Subject hep-ph nucl-th
AbstractIn treating the relativistic three-quark problem, a dressed-quark propagator parameterization is used which is compatible with recent lattice data and pion observables. Furthermore two-quark correlations are modeled as a series of quark loops in the scalar and axialvector channel. The resulting reduced Faddeev equations are solved for nucleon and delta. Nucleon electromagnetic form factors are calculated in a fully covariant and gauge--invariant scheme. Whereas the proton electric form factor $G_E$ and the nucleon magnetic moments are described correctly, the neutron electric form factor and the ratio $G_E/G_M$ for the proton appear to be quenched. The influence of vector mesons on the form factors is investigated which amounts to a 25 percent modification of the electromagnetic proton radii within this framework.
Source arXiv, hep-ph/0204178
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