Heavy quark interactions and quarkonium binding**Based on joint work with O Kaczmarek and F Karsch.

Abstract

We consider heavy quark interactions in quenched and unquenched lattice QCD. In a region just above the deconfinement point, non-Abelian gluon polarization leads to a strong increase in the binding. Comparing quark–antiquark and quark–quark interaction, the dependence of the binding on the separation distance r is found to be the same for the colorless singlet and the colored anti-triplet QQ state. In a potential model description of in-medium J/ψ behavior, this enhancement of the binding leads to a survival up to temperatures of 1.5 Tc or higher; it could also result in J/ψ flow.