Coherence, Mixing, and Interference Phenomena in RadiativeψDecays

Abstract

Ground-state and radially excited quarkonium configurations are all coherently produced in radiative $\psi$ decays with amplitudes which depend on the wave function at the origin. Configuration mixing in the mass matrix due to annihilation into gluons also depends on the wave function at the origin and shows the same coherence. Small interference and mixing amplitudes can produce large coherent effects which invalidate conventional arguments used to distinguish between glueballs and quarkonia.