Super-heavy Quarkonia as a probe of the QCD Vacuum
  We investigate the effect of a non-perturbative gluon condensate on the spectrum of bound states of extremely heavy quarks using Non-Relativistic-QCD (NRQCD). Simulations are done with an improved gluon action on small lattices. We compare our numerical results with perturbative calculations to test the consistency. 
J. Fingberg (Univ. of Wuppertal)