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

Abstract

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.

28 pages, 10 figures, 4 tables

References in corpus (9)

• Mesons in a Poincare Covariant Bethe-Salpeter Approach
• Bethe-Salpeter equation and a nonperturbative quark-gluon vertex
• Lattice quark propagator with staggered quarks in Landau and Laplacian gauges
• Nucleon mass and pion loops
• Axial vector diquark correlations in the nucleon: Structure functions and static properties
• Baryons as Relativistic Bound States of Quark and Diquark
• Nucleon mass and pion loops: Renormalization
• Pionic dressing of baryons in chiral quark models
• Chiral Properties of Quenched and Full QCD

Cited by in corpus (16)

• Baryons as relativistic three-quark bound states
• Nucleon electromagnetic form factors from the covariant Faddeev equation
• Delta and Omega electromagnetic form factors in a Dyson-Schwinger/Bethe-Salpeter approach
• A covariant view on the nucleons' quark core
• Nucleon to Delta electromagnetic transition in the Dyson-Schwinger approach
• Infrared and ultraviolet properties of the Landau gauge quark propagator
• Matrix algorithms for solving (in)homogeneous bound state equations
• Delta-baryon mass in a covariant Faddeev approach
• Solving Bethe-Salpeter scattering state equation in Minkowski space
• Hadronic Observables from Dyson-Schwinger and Bethe-Salpeter equations
• Medium modifications of nucleon electromagnetic form factors
• Relativistic quark-diquark model of baryons with a spin-isospin transition interaction
• Electromagnetic transition form factors of baryons in the space-like momentum region
• Non-perturbative Propagators, Running Coupling and Dynamical Mass Generation in Ghost-Antighost Symmetric Gauges in QCD
• Bethe-Salpeter scattering amplitude in Minkowski space
• Hadron properties from QCD bound-state equations: A status report