J/ψ and ηc above the deconfinement phase transition

Abstract

Analysing correlation functions of charmonia at finite temperature (T) on 323× (32–96) anisotropic lattices by the maximum entropy method (MEM), we find that J/ψ and ηc survive as distinct resonances in the plasma even up to T ≃ 1.6Tc and that they eventually dissociate between 1.6Tc and 1.7Tc (Tc is the critical temperature of deconfinement). This suggests that the deconfined plasma is non-perturbative enough to hold heavy-quark bound states. The importance of having sufficient number of temporal data points in the MEM analysis is also emphasized.