Energy dependence of jet transport parameter and parton saturationin quark-gluon plasma
We study the evolution and saturation of the gluondistribution function in the quark-gluon plasma as probed by apropagating parton and its effect on the computation of jet quenching ortransport parameter $$\hat q $$. For thermal partons, the saturation scale$$Q2_s$$ is found to be proportional to the Debye screening mass $$\mu_D2$$.For hard probes, evolution at small $$x=Q2_s/6ET$$ leads to jet energydependence of hat q. We study this dependence for both a conformal gaugetheory in weak and strong coupling limit and for (pure gluon) QCD. Theenergy dependence can be used to extract the shear viscosity $$\eta$$ ofthe medium since $$\eta$$ can be related to the transport parameter forthermal partons in a transport description. We also derive upper boundson the transport parameter for both energetic and thermal partons. Thelater leads to a lower bound on shear viscosity-to-entropy density ratiowhich is consistent with the conjectured lower bound $$\eta/s\geq 1/4\pi$$.Implications on the study of jet quenching at RHIC and LHC and the bulkproperties of the dense matter are discussed.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. NuclearPhysics
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 929024
- Report Number(s):
- LBNL-63308; R&D Project: NTCOST; BnR: KB0301020; TRN: US0803313
- Journal Information:
- Physical Review C, Vol. 0, Issue 0; Related Information: Journal Publication Date: 0
- Country of Publication:
- United States
- Language:
- English
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