High-momentum transfer behaviour of nucleon form factors from chiral invariant Lagrangians

Abstract

We have evaluated the behaviour of the isovector and isoscalar form factors F 1( q 2) and F 2( q 2) for large q 2 using a chiral invariant Lagrangian to second and third order in perturbation theory. The results depend upon the specific model chosen in this lower-order approximation, but when the effects of higher-order terms are included, the results are in agreement with the usual dipole fit to the electric and magnetic form factors.