Jet thermalization in QCD kinetic theory

Abstract

We perform numerical studies in QCD kinetic theory to investigate the energy and angular profiles of a high energy parton - as a proxy for a jet produced heavy ion collisions - passing through a Quark-Gluon Plasma (QGP). We find that the fast parton loses energy to the plasma mainly via a radiative turbulent gluon cascade that transport energy locally from the jet down to the temperature scale where dissipation takes place. In this first stage, the angular structure of the turbulent cascade is found to be relatively collimated. However, when the lost energy reaches the plasma temperature is it rapidly transported to large angles w.r.t. the jet axis and thermalizes. We investigate the contribution of the soft jet constituents to the total jet energy. We show that for jet opening angles of about 0.3 rad or smaller the effect is negligible. Conversely, larger opening angles become more and more sensitive to the thermal component of the jet and thus to medium response. Our result showcase the importance of the jet cone size in mitigating or enhancing the details of dissipation in jet quenching observables.

41 pages, 12 figures,

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Cited by in corpus (10)

• Jet quenching parameter in QCD kinetic theory
• Hard jet substructure in a multistage approach
• Isolating perturbative QCD splittings in heavy-ion collisions
• Minijet quenching in non-equilibrium quark-gluon plasma
• Quenching jets increases their flavor
• Flavor and path-length dependence of jet quenching from inclusive jet and γ-jet suppression
• Search for quasi-particle scattering in the quark-gluon plasma with jet splittings in pp and Pb$-$Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}=5.02$ TeV
• Suppression of the jet quenching parameter near the critical temperature
• The effect of recoils on soft-drop-groomed observables in $\gamma$-tagged jets in a multistage approach
• Deriving a parton shower for jet thermalization in QCD plasmas