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arxiv: 1104.4505 · v1 · submitted 2011-04-22 · ✦ hep-ph · hep-lat· nucl-ex· nucl-th

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Nucleon electromagnetic form factors from the covariant Faddeev equation

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classification ✦ hep-ph hep-latnucl-exnucl-th
keywords electromagneticformnucleonfactorsfaddeevphotonagreeamplitude
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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.

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