Effects of Dynamical Quarks on the Stability of Heavy Quarkonia in Quark-Gluon Plasma
Abstract
To study the stability of heavy quarkonia in quark-gluon plasma, we use a color-singlet Q-Qbar potential determined previously to be a well-defined linear combination of the free energy F1 and the internal energy U1. Using the lattice gauge results of Kaczmarek et al., the dissociation temperatures of J/psi and chib in quenched QCD are found to be 1.62Tc and 1.18Tc respectively, in good agreement with spectral function analyses. The dissociation temperature of J/psi in full QCD with 2 flavors is 1.42Tc. Thus, the presence of dynamical quarks in full QCD lowers the dissociation temperature of J/psi, but J/psi remains bound up to 1.42Tc.
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