HADRONIC WAVE-FUNCTIONS IN THE INSTANTON MODEL

In this paper we wish to study hadronic wave functions using an instan ton model for the QCD vacuum. The wave functions are defined in terms of gauge-invariant Bethe-Salpeter amplitudes which we have determined numerically using a Monte Carlo simulation of the instanton ensemble. We find that the pion and the proton, as well as the rho meson and the DELTA, have very similar wave functions but observe a sizable splitti ng between mesons or baryons with different spin. We compare our resul ts with data obtained in lattice gauge simulations.