Minijet quenching in non-equilibrium quark-gluon plasma

Abstract

We study the energy deposition and thermalisation of high-momentum on-shell partons (minijets) travelling through a non-equilibrium Quark-Gluon Plasma using QCD kinetic theory. For thermal backgrounds, we show that the parton energy first flows to the soft sector by collinear cascade and then isotropises via elastic scatterings. In contrast, the momentum deposition from a minijet reaches the equilibrium distribution directly. For expanding non-equilibrium QGP, we study the time for a minijet perturbation to lose memory of its initial conditions, namely, the hydrodynamisation time. We show that the minijet evolution scales well with the relaxation time ${\tau }_R\propto \eta /s/T(\tau )$, where $T(\tau )$ is the effective temperature and $\eta /s$ is the viscosity over entropy ratio.

38 pages, 19 figures, minor corrections and figure added, published version

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Cited by in corpus (5)

• The impact of glasma on heavy flavor azimuthal correlations and spectra
• Giving wake to energy-energy correlators: Hydrodynamic response on the celestial sphere
• Soft-gluon exchange matters: isotropic screening in QCD kinetic theory
• Jet quenching in out-of-equilibrium QCD matter
• Deriving a parton shower for jet thermalization in QCD plasmas