  Among quantities playing a central role in the theoretical interpretation of
heavy ion collision experiments at RHIC and LHC are so-called transport
coefficients. Out of those heavy quark diffusion coefficients play an important
role e.g. for the analysis of the quenching of jets containing c or b quarks (D
or B mesons) as observed at RHIC and LHC. We report on a lattice investigation
of heavy quark momentum diffusion within pure SU(3) plasma above the
deconfinement transition with the quarks treated to leading order in the heavy
mass expansion. We measure the relevant colour-electric Euclidean correlator
and based on several lattice spacings perform the continuum extrapolation. This
extends our previous studies progressing towards a removal of lattice artifacts
and a physical interpretation of the results. We find that the correlation
function clearly exceeds its perturbative counterpart which suggests that at
temperatures just above the critical one, non-perturbative interactions felt by
the heavy quarks are stronger than within the weak-coupling expansion. Using an
Ansatz for the spectral function which includes NNLO perturbative contributions
we were able to determine, for the first time, a continuum estimate for the
heavy quark momentum diffusion coefficient.
