Towards a non-perturbative measurement of the heavy quark momentum diffusion coefficient
Abstract
We report on a lattice investigation of heavy quark diffusion within pure SU(3) plasma above the deconfinement transition, with the quarks treated to leading 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 counterpart. Even without analytic continuation, this 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. After introducing rough modelling of the spectral shape, diffusion coefficients down to D ~ 0.5/T appear possible.
- Publication:
-
Proceedings of the XXIX International Symposium on Lattice Field Theory (Lattice 2011). July 10-16
- Pub Date:
- 2011
- DOI:
- 10.22323/1.139.0202
- arXiv:
- arXiv:1109.3941
- Bibcode:
- 2011slft.confE.202F
- Keywords:
-
- High Energy Physics - Lattice;
- High Energy Physics - Phenomenology
- E-Print:
- 7 pages. To appear in the Proceedings of the XXIX International Symposium on Lattice Field Theory, July 10-16, 2011, Squaw Valley, Lake Tahoe, California