ON THE DIRAC STRUCTURE OF CONFINEMENT

The Dirac structure of confinement is shown to be of a timelike-vector nature in the heavy quark limit of QCD. This stands in contradiction with the phenomenological success of the Dirac scalar confining potent ial. A resolution is achieved through the demonstration that an effect ive scalar interaction is dynamically generated by nonperturbative mix ing between ordinary and hybrid Q (Q) over bar rates. The resolution d epends crucially on the collective nature of the gluonic degrees of fr eedom. This implies that dynamical gluonic effects are vital when atte mpting to incorporate fine structure in models of the Q (Q) over bar i nteraction.