English

Nucleon electromagnetic form factors from the covariant Faddeev equation

High Energy Physics - Phenomenology 2011-08-08 v1 High Energy Physics - Lattice Nuclear Experiment Nuclear Theory

Abstract

We compute the electromagnetic form factors of the nucleon in the Poincare-covariant Faddeev framework based on the Dyson-Schwinger equations of QCD. The general expression for a baryon's electromagnetic current in terms of three interacting dressed quarks is derived. Upon employing a rainbow-ladder gluon-exchange kernel for the quark-quark interaction, the nucleon's Faddeev amplitude and electromagnetic form factors are computed without any further truncations or model assumptions. The form factor results show clear evidence of missing pion-cloud effects below a photon momentum transfer of ~2 GeV^2 and in the chiral region whereas they agree well with experimental data at higher photon momenta. Thus, the approach reflects the properties of the nucleon's quark core.

Keywords

Cite

@article{arxiv.1104.4505,
  title  = {Nucleon electromagnetic form factors from the covariant Faddeev equation},
  author = {Gernot Eichmann},
  journal= {arXiv preprint arXiv:1104.4505},
  year   = {2011}
}

Comments

23 pages, 10 figures, 2 tables