Nucleon form factors from a covariant quark core: Limits in their description
Date
2003
Authors
Oettel, M.
Alkofer, Reinhard
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Journal article
Citation
European Physical Journal A, 2003; 16:95-109
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Abstract
In treating the relativistic 3–quark problem, a dressed–quark propagator parameterization
is used which is compatible with recent lattice data and pion observables.
Furthermore 2–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 GE
and the nucleon magnetic moments are described correctly, the neutron electric
form factor and the ratio GE/GM for the proton appear to be quenched. The influence
of vector mesons on the form factors is investigated which amounts to a 25 %
modification of the electromagnetic proton radii within this framework.
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Copyright © 2002 Springer-Verlag.
Submitted to Cornell University’s online archive www.arXiv.org in 2002 by Reinhard Alkofer.
Post-print sourced from www.arxiv.org.