# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
darmstadtium
Europe/Zurich timezone

## Towards continuum results of the heavy quark momentum diffusion coefficient

20 May 2014, 15:40
20m
platinum (darmstadtium)

### platinum

#### darmstadtium

Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Open Heavy Flavour and Quarkonia

### 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)

 Slides