POTENTIAL REGIME FOR HEAVY QUARKS DYNAMICS AND LORENTZ NATURE OF CONFINEMENT

Propagation of the heavy quark in the field of a static antiquark sour ce is studied in the framework of effective Dirac equation. The model of QCD vacuum is described by bilocal gluonic correlators. In the heav y quark limit the effective interaction is reduced to the potential on e with 5/6 Lorentz scalar and 1/6 Lorentz vector linear confinement, w hile spin-orbit term is in agreement with Eichten-Feinberg-Gromes resu lts. New spin-independent corrections to the leading confining regime are identified, which arise due to the nonlocality of the interaction in time direction and quark Zitterbewegung. (C) 1997 Elsevier Science B.V.