Nucleon distribution amplitudes from a relativistic quark model

Abstract

We show that the essential features of the Chernyak-Zhitnitsky distribution amplitudes for the nucleon can be understood with the basic concepts of the constituent quark model formulated in the light-cone Fock approach. The key ingredient of the model is the relativistic nonstatic spin-wave function together with the fact that quarks bound in light hadrons are highly relativistic (small-valence-size hypothesis). The picture is consistent with that of an analogous study for the qq¯ system.