WHAT DO HEAVY-LIGHT (Q(Q)OVER-BAR) QUARK SYSTEMS TELL US ABOUT QCD VACUUM PROPERTIES

Arguments in favor of a large magnitude (at least two- three times big ger than its factorized value) of the mixed vacuum condensate [qG(munu )(a)G(munu)(q)q] are given. The analysis is based on the strict inequa lities which follow from the QCD sum rules method and on very plausibl e phenomenological assumptions like m(Bs) > m(Bu) for the few lowest e xited QqBAR states in a heavy quark limit mQ --> infinity. The same ar guments show the suppression of the SU(3) symmetry breaking effects fo r vacuum condensates when the additional gluon fields are included.