K +N scattering in the constituent quark model

Abstract

We calculate S-wave phase shifts of the KN system in the framework of a nonrelativistic quark model, using variational methods (generator coordinates). We show that the I = 0 channel is determined by the QCD residual interaction, which leads to a small repulsion, and that the I = 1 channel receives strong repulsive contributions already from quark exchange. We discuss the relevance and physical origin of these results. We furthermore construct an approximate local potential extracted from the nonlocal cluster interaction.