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Radiative heavy quark energy loss in an expanding viscous QCD plasma

2018; American Physical Society; Volume: 97; Issue: 6 Linguagem: Inglês

10.1103/physrevc.97.064916

2470-0002

Sreemoyee Sarkar, Chandrodoy Chattopadhyay, Subrata Pal,

Particle physics theoretical and experimental studies

We study viscous effects on heavy quark radiative energy loss in a dynamically screened medium with boost-invariant longitudinal expansion. We calculate, to first order in opacity, the energy loss by incorporating viscous corrections in the single-particle phase-space distribution function within relativistic dissipative hydrodynamics. We consider Grad's 14-moment and the Chapman-Enskog-like methods for the nonequilibrium distribution functions. Our numerical results for the charm quark radiative energy loss show that, as compared to an expanding ideal (nonviscous) fluid, viscosity in the evolution leads to somewhat enhanced energy loss which is rather insensitive to the underlying viscous hydrodynamic models used. Further inclusion of a viscous correction induces larger energy loss, and the magnitude and pattern of this enhancement crucially depend on the form of viscous corrections used.