Jet quenching parameter ˆ q in the stochastic QCD vacuum

We argue that the radiative energy loss of a parton traversing the quark-gluon plasma is deter- mined by Landau damping of soft modes in the plasma. Using this idea, we calculate the jet quenching parameter of a gluon. The calculation is done in SU(3) quenched QCD within the stochastic vacuum model. At the LHC-relevant temperatures, the result depends on the gluon condensate, the vacuum correlation length, and the gluon Debye mass. Numerically, when the temperature varies from T = Tc to T = 900 MeV, the jet quenching parameter rises from ˆ q = 0 to approximately 1. 8G eV 2 /fm. We compare our results with