Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-05-23
Prog.Theor.Phys.Suppl.174:122-128,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages; invited talk at the YITP symposium on "Fundamental Problems in Hot and/or dense QCD", Kyoto, Japan, 3-6 March 2008
Scientific paper
10.1143/PTPS.174.122
We discuss the properties of the collective modes of a system composed by a thermalized quark-gluon plasma traversed by a relativistic jet of partons. The transport equations obeyed by the components of the plasma and of the jet are studied in the Vlasov approximation. Assuming that the partons in the jet can be described with a tsunami-like distribution function we derive the expressions of the dispersion law of the collective modes. Then the behavior of the unstable gauge modes of the system is analyzed for various values of the velocity of the jet, of the momentum of the collective modes and of the angle between these two quantities. We find that the most unstable modes are those with momentum orthogonal to the velocity of the jet, and the effect is stronger for ultrarelativistic jet velocities. Our results suggest a new possible collective mechanism for the description of the jet quenching phenomena in heavy ion collisions.
Mannarelli Massimo
Manuel Cristina
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