Regular Article - Theoretical Physics
Jet quenching parameter in the stochastic QCD vacuum with Landau damping
Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, 69120, Heidelberg, Germany
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Revised: 25 March 2008
Published online: 7 May 2008
We argue that the radiative energy loss of a parton traversing the quark–gluon plasma is determined 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 to approximately 1.8 GeV2/fm. We compare our results with the predictions of perturbative QCD and other calculations.
© Springer-Verlag , 2008