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Assuming the gluon field is well approximated by instanton configurations wederive a partition function and calculate the specific correlators. Namely, theheavy quark propagator and heavy quark-aniquark correlator with the account ofthe light quark determinant and QCD instanton vacuum properties. With theseknowledge we calculate the light quark contribution to the interaction betweenheavy quarks, which might be essential for the properties of a few heavy quarkssystems like oniums and double-heavy baryons.

Heavy-Light Quark Systems in the Instanton Vacuum