We study the jet quenching parameter $\hat q$ in a nonequilibrium 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 nonequilibrium distributions that model pertinent features of the bottom-up thermalization scenario, we analytically assess how anisotropy, underoccupation, or overoccupation affect the jet quenching parameter. Our work provides more details on the $\hat q$ formula used in our preceding work [Phys. Lett. B 850, 138525 (2024) PYLBAJ0370-269310.1016/j.physletb.2024.138525] 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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Project title:
Nichtperturbative Eigenschaften evolvierenden gluonischer Plasmen: P 34455-N (FWF - Österr. Wissenschaftsfonds) Doktoratskolleg Particles and Interactions: W 1252-N27 (FWF - Österr. Wissenschaftsfonds)
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Project (external):
Academy of Finland Academy of Finland European Research Council Knut and Alice Wallenberg foundation European Union’s Horizon 2020
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Project ID:
Centre of Excellence in Quark Matter (project 346324) 321840 ERC-2018-ADG-835105 YoctoLHC 2017.0036 STRONG-2020 project (Grant No. 824093)
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Research Areas:
Quantum Many-body Systems Physics: 50% Modeling and Simulation: 50%
