Jet quenching parameter \hat q in the stochastic QCD vacuum with Landau damping

Details Jet quenching parameter \hat q in the stochastic QCD vacuum with Landau damping Jet quenching parameter \hat q in the stochastic QCD vacuum with Landau damping

2007-10-08

arxiv.org/abs/0710.1540v2

Eur.Phys.J.C55:439-447,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 6 figures, discussions and references added; final version to appear in Eur. Phys. J. C

Scientific paper

10.1140/epjc/s10052-008-0599-1

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=T_c to T=900 MeV, the jet quenching parameter rises from \hat q=0 to approximately 1.8 GeV^2/fm. We compare our results with the predictions of perturbative QCD and other calculations.

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