Finite temperature charmonium spectral functions in the pseudoscalar and vector channels are studied in lattice QCD with 2+1 flavours of dynamical Wilson quarks, on fine isotropic lattices (with a lattice spacing of 0.057 fm), with a non-physical pion mass of mπ≈ 545 MeV. The highest temperature studied is approximately 1.4Tc. Up to this temperature no significant variation of the spectral function is seen in the pseudoscalar channel. The vector channel shows some temperature dependence, which seems to be consistent with a temperature dependent low frequency peak related to heavy quark transport, plus a temperature independent term at \omega>0. These results are in accord with previous calculations using the quenched approximation.
@article{arxiv.1401.5940,
title = {Charmonium spectral functions from 2+1 flavour lattice QCD},
author = {Szabolcs Borsanyi and Stephan Durr and Zoltan Fodor and Christian Hoelbling and Sandor D. Katz and Stefan Krieg and Simon Mages and Daniel Nogradi and Attila Pasztor and Andreas Schafer and Kalman K. Szabo and Balint C. Toth and Norbert Trombitas},
journal= {arXiv preprint arXiv:1401.5940},
year = {2014}
}