A1 Journal article (refereed)
Limiting attractors in heavy-ion collisions (2024)

Boguslavski, K., Kurkela, A., Lappi, T., Lindenbauer, F., & Peuron, J. (2024). Limiting attractors in heavy-ion collisions. Physics Letters B, 852, Article 138623. https://doi.org/10.1016/j.physletb.2024.138623

JYU authors or editors

Publication details

All authors or editors: Boguslavski, K.; Kurkela, A.; Lappi, T.; Lindenbauer, F.; Peuron, J.

Journal or series: Physics Letters B

ISSN: 0370-2693

eISSN: 1873-2445

Publication year: 2024

Publication date: 04/04/2024

Volume: 852

Article number: 138623

Publisher: Elsevier

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.physletb.2024.138623

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/94288

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2401.09088

Abstract

We study universal features of the hydrodynamization process in heavy-ion collisions using QCD kinetic theory simulations for a wide range of couplings. We introduce the new concept of limiting attractors, which are obtained by extrapolation to vanishing and strong couplings. While the hydrodynamic limiting attractor emerges at strong couplings and is governed by the viscosityrelated relaxation time scale τR, we identify a bottom-up limiting attractor at weak couplings. It corresponds to the late stages of the perturbative bottom-up thermalization scenario and exhibits isotropization on the time scale τBMSS = α −13/5 s /Qs. In contrast to hydrodynamic limiting attractors, at finite couplings the bottom-up limiting attractor provides a good universal description of the pre-hydrodynamic evolution of jet and heavy-quark momentum broadening ratios ˆq yy/qˆ zz and κT /κz. We also provide parametrizations for these ratios for phenomenological studies of preequilibrium effects on jets and heavy quarks.

Keywords: particle physics; quark-gluon plasma; quantum chromodynamics

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Ministry reporting: Yes

VIRTA submission year: 2024

Preliminary JUFO rating: 3