Pion light-cone wave functions and light-front quark model

Abstract

We discuss a relation between the light-front quark model and QCD. We argue that this model can be used for an evaluation of the light-cone wave functions for moderate values of u, but that it is inapplicable for this purpose in the region near the end points u=(0,1). We find additional support for a recent analysis in which it was claimed that the twist-two pion wave function attains its asymptotic form. The asymptotic twist-four two-particle wave function is also in good agreement with the light-front quark model.