We study charmoinum correlators and spectral functions at finite temperature within the quenched approximation using isotropic lattices with lattice spacing a^-1=4.86 GeV and 9.72 GeV. Although we observe some medium modifications of the ground state charmonium spectral function above deconfinement, we find that ground state charmonia (J/psi and eta_c) exist in the deconfined phase at least up to temperatures as high as 1.5Tc. P-wave charmonia (chi_c) on the other hand are dissociated already at 1.12Tc.
@article{arxiv.hep-lat/0309012,
title = {Charmonium at finite temperature},
author = {P. Petreczky and S. Datta and F. Karsch and I. Wetzorke},
journal= {arXiv preprint arXiv:hep-lat/0309012},
year = {2009}
}