CONSTRAINTS ON QUARK MASSES IN POTENTIAL MODELS

Given a number of reasonable hypotheses, the mass and charge mean-squa re radii as well as the electric and magnetic form factors and magneti c moments for baryons are revisited in the light of general space wave functions. In particular, the experimental magnetic moments allow to put very drastic bounds on the quark masses as derived from usual pote ntial models. It is shown that the experimental situation cannot be ex plained in the framework of such models.