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The extreme state of matter produced in heavy-ion collisions at ultrarelativistic colliders can be characterized as a strongly coupled quark-gluon plasma. Within this plasma, the heavy quarks can be seen to behave according to Langevin dynamics, with a diffusion coefficient related to their momentum distibution. In this talk I will review the theoretical setting and present a lattice-QCD determination of the heavy quark momentum diffusion coefficient over a wide range of temperatures.
Peter Thirolf (LMU) / Norbert Kaiser (TUM)