Soft-pion theorems and a light-cone quark model

Abstract

It is shown that in a light-cone representation of nucleons soft-pion theorems which are violated in instant-form quark models can be recovered with suitable choices of parameters of the model. Instantaneous terms must be included for the soft-pion limit. The proton form factors are fit up to $q^2$=3 (GeV/c${)}^2$ in this model.