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arXiv · 2312.00447

Jet quenching parameter in QCD kinetic theory

Kirill Boguslavski·Aleksi Kurkela·Tuomas Lappi·Florian Lindenbauer·Jarkko Peuron
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Abstract

We study the jet quenching parameter $\hat q$ in a non-equilibrium plasma using the QCD effective kinetic theory. We discuss subleading terms at large jet momentum p, show that our expression for $\hat q$ reproduces thermal results at small and large transverse momentum cutoffs for infinite p and construct an interpolation between these limits to be used in phenomenological applications. Using simple non-equilibrium distributions that model pertinent features of the bottom-up thermalization scenario, we analytically assess how anisotropy, under- or overoccupation affect the jet quenching parameter. Our work provides more details on the $\hat q$ formula used in our preceding work [arXiv:2303.12595] and sets the stage for further numerical studies of jet momentum broadening in the initial stages of heavy-ion collisions from QCD kinetic theory.

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Kirill Boguslavski, Aleksi Kurkela, Tuomas Lappi, Florian Lindenbauer, Jarkko Peuron. 2023-12-01. Jet quenching parameter in QCD kinetic theory. https://doi.org/10.1103/physrevd.110.034019

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