Super-heavy quarkonia and the gluon condensate

The early idea that a non-perturbative gluon condensate affects the spectru m of heavy quarks is revisited in the light of modern simulation techniques . We evaluate the low lying spectrum of bound states of two heavy quarks fo r large hypothetical quark mass, m(Q) > m(b), using non-relativistic QCD an d compare with other models to test the consistency.