Minijet thermalization and jet transport coefficients in QCD kinetic theory
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918500454367232 |
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| author | Boguslavski, Kirill Lindenbauer, Florian Mazeliauskas, Aleksas Takacs, Adam Zhou, Fabian |
| author_facet | Boguslavski, Kirill Lindenbauer, Florian Mazeliauskas, Aleksas Takacs, Adam Zhou, Fabian |
| contents | We apply weakly coupled QCD kinetic theory to investigate the thermalization of high-momentum on-shell partons (minijets) in a Quark-Gluon Plasma (QGP). Our approach incorporates isotropic hard thermal loop screening to model soft quark and gluon exchanges, allowing us to verify consistency with established analytic results of jet transport coefficients. We perform kinetic simulations of minijets propagating through a thermal gluon plasma, incorporating both collinear radiation and elastic scatterings. The resulting evolution is compared to predictions from jet transport coefficients, including the longitudinal and transverse jet-quenching parameters $\hat{q}$, energy loss, and the drag coefficient. We find that standard definitions of jet transport coefficients neglect the contributions from recoiling medium particles. Including these contributions restores consistency with the kinetic evolution. Finally, we show that the minijet thermalization time scales remarkably well with $\hat{q}$ and we produce a phenomenological estimate of the minijet quenching time in heavy-ion collisions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_25669 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Minijet thermalization and jet transport coefficients in QCD kinetic theory Boguslavski, Kirill Lindenbauer, Florian Mazeliauskas, Aleksas Takacs, Adam Zhou, Fabian High Energy Physics - Phenomenology Nuclear Theory We apply weakly coupled QCD kinetic theory to investigate the thermalization of high-momentum on-shell partons (minijets) in a Quark-Gluon Plasma (QGP). Our approach incorporates isotropic hard thermal loop screening to model soft quark and gluon exchanges, allowing us to verify consistency with established analytic results of jet transport coefficients. We perform kinetic simulations of minijets propagating through a thermal gluon plasma, incorporating both collinear radiation and elastic scatterings. The resulting evolution is compared to predictions from jet transport coefficients, including the longitudinal and transverse jet-quenching parameters $\hat{q}$, energy loss, and the drag coefficient. We find that standard definitions of jet transport coefficients neglect the contributions from recoiling medium particles. Including these contributions restores consistency with the kinetic evolution. Finally, we show that the minijet thermalization time scales remarkably well with $\hat{q}$ and we produce a phenomenological estimate of the minijet quenching time in heavy-ion collisions. |
| title | Minijet thermalization and jet transport coefficients in QCD kinetic theory |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2510.25669 |