119240334
Heavy quark diffusion from lattice QCD spectral functions
We analyze the low-frequency part of charmonium spectral functions on large lattices close to the continuum limit in the temperature region 1.5 T/Tc 3 as well as for T 0.75Tc. We present evidence for the existence of a transport peak above Tc and its absence below Tc. The heavy quark diffusion constant is then estimated using the Kubo formula. As part of the calculation we also determine the temperature dependence of the signature for the charmonium bound state in the spectral function and discuss the fate of charmonium states in the hot medium.
56205427
Towards a non-perturbative measurement of the heavy quark momentum diffusion coefficient
We report on a lattice investigation of heavy quark diffusion within pure SU(3) plasma above the deconfinement transition, with the quarks treated to leadin g order in the heavy mass expansion. Using a multilevel algorithm, several volumes and lattice spacings, as well as tree-level improvement and perturbative renormalization, we measure the relevant “colour-electric” Euclidean correlator, finding that it clearly exceeds its perturbative co unterpart. Even without analytic continuation, this suggests that at temperatures just above the cri tical one, non-perturbative interactions felt by the heavy quarks are stronger than within the weak-coupling expansion. After introducing rough modelling of the spectral shape, diffusion coefficien ts down to D∼ 0.5/T appear possible.
172420274
A Study of High Energy Bursts