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A field-theoretic parametrization is proposed for nucleon electromagneticform factors at momentum transfer less than 600 MeV. The parametrization ispart of a larger effective field theory lagrangian that is Lorentz covariantand chirally symmetric, and that has been used to successfully describe bulkand single-particle properties of medium to heavy mass nuclei. Theparametrization is based on vector meson dominance and a derivative expansionof nucleon couplings to the electromagnetic fields. At lowest order in theexpansion, it is possible to fit all four parameters to modern data on the rmsradii of the nucleon form factors. At next-to-leading order it is possible tofit the form factors to within a few percent up to momentum transfers of 600MeV. The vector meson dominance contributions are crucial in this fit, since asimple expansion in powers of momentum transfer would require many, many termsto achieve comparable accuracy. The ability to fit single-nucleon form factorsup to 600 MeV momentum transfer makes possible the study of two-bodyelectromagnetic exchange currents within this effective field theory framework.

A Field-Theoretic Parametrization of Low-Energy Nucleon Form Factors