On the isovector form factors of the nucleon in meson theory

Abstract

We present a calculation of the nucleon isovector form factors for low momentum transfer. Our model is based on skeleton diagrams in pseudoscalar πN interaction where unknown parameters describing higher order corrections are fixed such that a ρ meson is generated dynamically with the correct properties. The normalization of the form factors and the radii agree well with experiment. For −q2 up to 1 GeV2 the contributions of the π θ-intermediate state do not fall off rapidly enough to give perfect agreement with the dipole formulae.