Nucleon Electromagnetic Form Factors in a chiral constituent-quark model

TL;DR

This paper calculates nucleon electromagnetic form factors using an extended chiral constituent-quark model with meson exchanges, emphasizing the importance of two-body currents for accurate magnetic form factors and moments.

Contribution

It introduces a comprehensive chiral quark model with meson exchanges and two-body currents that enhance the accuracy of nucleon magnetic form factor calculations.

Findings

Two-body currents significantly improve magnetic form factor estimates.

The model preserves gauge invariance and current conservation.

Results align better with experimental data.

Abstract

The electromagnetic form factors of the nucleon are calculated in an extended chiral constituent-quark model where the effective interaction is described by the exchange of pseudoscalar, vector, and scalar mesons. Two-body current-density operators, constructed consistently with the extended model Hamiltonian in order to preserve gauge invariance and current conservation, are found to give a significant contribution to the nucleon magnetic form factors and improve the estimates of the nucleon magnetic moments.