Nucleon form factors from a covariant quark core: limits in their description

Details Nucleon form factors from a covariant quark core: limits in their description Nucleon form factors from a covariant quark core: limits in their description

2002-04-16

arxiv.org/abs/hep-ph/0204178v1

Eur.Phys.J.A16:95-109,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 10 figures, 4 tables

Scientific paper

10.1140/epja/i2002-10070-4

In 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.

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