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Hard parton damping in hot QCD

André Peshier

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The gluon and quark collisional widths in hot QCD plasmas are discussed with emphasis on temperatures near Tc, where the coupling is large. Considering the effect on the entropy, which is known from lattice calculations, it is argued that the width of the partons, which in the perturbative limit is given by γ ~ g2ln(g−1)T, should be sizeable at intermediate temperatures but has to be small close to Tc. This behaviour implies a substantial reduction of the radiative energy loss of jets near Tc.


PACS

12.38.Gc Lattice QCD calculations

12.38.Mh Quark–gluon plasma

11.10.Gh Renormalization

12.39.-x Phenomenological quark models

Subjects

Particle physics and field theory

Dates

Issue 4 (April 2005)

Received 16 December 2004

Published 17 March 2005



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