Heavy quark diffusion coefficient in heavy-ion collisions via kinetic theory
Abstract
We compute the heavy quark momentum diffusion coefficient κ using QCD kinetic theory for a system going through bottom-up isotropization in the initial stages of a heavy ion collision. We find that the values of κ are within 30% from a thermal system at the same energy density. When matching for other quantities we observe considerably larger deviations. We also observe that the diffusion coefficient in the transverse direction is larger at high occupation numbers, whereas for an underoccupied system the longitudinal diffusion coefficient dominates. The behavior of the diffusion coefficient can be understood on a qualitative level based on the Debye mass mD and the effective temperature of soft modes T∗. Our results for the kinetic evolution of κ in different directions can be used in phenomenological descriptions of heavy quark diffusion and quarkonium dynamics to include the impact of pre-equilibrium stages.
Main Authors
Format
Articles
Research article
Published
2024
Series
Subjects
Publication in research information system
Publisher
American Physical Society (APS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202405033287Käytä tätä linkitykseen.
Review status
Peer reviewed
ISSN
2470-0010
DOI
https://doi.org/10.1103/PhysRevD.109.014025
Language
English
Published in
Physical Review D
Citation
- Boguslavski, K., Kurkela, A., Lappi, T., Lindenbauer, F., & Peuron, J. (2024). Heavy quark diffusion coefficient in heavy-ion collisions via kinetic theory. Physical Review D, 109(1), Article 014025. https://doi.org/10.1103/PhysRevD.109.014025
License
Funder(s)
European Commission
Research Council of Finland
Research Council of Finland
European Commission
Funding program(s)
RIA Research and Innovation Action, H2020
Centre of Excellence, AoF
Academy Project, AoF
ERC Advanced Grant
RIA Research and Innovation Action, H2020
Huippuyksikkörahoitus, SA
Akatemiahanke, SA
ERC Advanced Grant
Additional information about funding
This work is supported by the European Research Council, ERC-2018-ADG-835105 YoctoLHC. This work was also supported under the European Union’s Horizon 2020 research and innovation by the STRONG-2020 project (Grant Agreement No. 824093). The content of this article does not reflect the official opinion of the European Union and responsibility for the information and views expressed therein lies entirely with the authors. This work was funded in part by the Knut and Alice Wallenberg foundation, Contract No. 2017.0036. T. L. and J. P. have been supported by the Academy of Finland, by the Centre of Excellence in Quark Matter (Project No. 346324) and Project No. 321840. K. B. and F. L. would like to thank the Austrian Science Fund (FWF) for support under Project No. P 34455, and F. L. is additionally supported by the Doctoral Program W1252-N27 Particles and Interactions. The authors wish to acknowledge CSC–IT Center for Science, Finland, for computational resources. We acknowledge grants of computer capacity from the Finnish Grid and Cloud Infrastructure (persistent identifier urn:nbn:fi:research-infras-2016072533). The authors also wish to acknowledge the Vienna Scientific Cluster (VSC) project 71444 for computational resources.
Copyright© Authors 2024