Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-07-29
JHEP 0909:068,2009
Physics
High Energy Physics
High Energy Physics - Theory
30 pages, 5 figures, references added, minor corrections. To be published in JHEP
Scientific paper
10.1088/1126-6708/2009/09/068
The drag of a heavy quark and the jet quenching parameter are studied in the strongly coupled N=2* plasma using the AdS/CFT correspondence. Both increase in units of the spatial string tension as the theory departs from conformal invariance. The description of heavy quark dynamics using a Langevin equation is also considered. It is found that the difference between the velocity dependent factors of the transverse and longitudinal momentum broadening of the quark admit an interpretation in terms of relativistic effects, so the distribution is spherical in the quark rest frame. When conformal invariance is broken there is a broadening of the longitudinal momentum distribution. This effect may be useful in understanding the jet distribution observed in experiments.
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