Speaker
Dr
Olaf Kaczmarek
(University of Bielefeld)
Description
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 coefficents 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 study [1,2] 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. Our results will be
compared to heavy quark diffusion coefficients [3] obtained from
charmonium vector correlation functions.
[1] A. Francis, O. Kaczmarek, M. Laine, M. Müller, T. Neuhaus and H. Ohno,
"Towards the continuum limit in transport coefficient computations",
arXiv:1311.3759.
[2] A. Francis, O. Kaczmarek, M. Laine and J. Langelage,
"Towards a non-perturbative measurement of the heavy quark momentum diffusion coefficient", arXiv:1109.3941.
[3] H.T. Ding, A. Francis, O. Kaczmarek, F. Karsch, H. Satz and W. Soeldner,
"Charmonium properties in hot quenched lattice QCD", Phys.Rev.D86 (2012) 014509, arXiv:1204.4945.
Primary author
Dr
Olaf Kaczmarek
(University of Bielefeld)
