# Initial Stages 2021

Jan 10 – 15, 2021
Weizmann Institute of Science
Asia/Jerusalem timezone
See you at IS2023 in Copenhagen in June 2023

## Heavy quark diffusion in an overoccupied gluon plasma

Jan 12, 2021, 7:20 PM
20m
Andrea's room 2 (vDLCC)

### Andrea's room 2

#### vDLCC

oral The initial stages of heavy-ion collisions

### Speaker

Jarkko Peuron (ECT*)

### Description

We extract the heavy-quark diffusion coefficient $\kappa$ and the resulting momentum broadening $\langle p^2 \rangle$ in an overoccupied gluon plasma. We find several features in the time dependence of the momentum broadening: a short initial rapid growth of $\langle p^2 \rangle$ followed by linear growth in time due to Langevin-type dynamics and damped oscillations around this growth at the plasmon frequency. We show that these oscillations arise from an excess of gluons in the infrared and are therefore a gauge invariant confirmation of the infrared enhancement we have previously observed in gauge-fixed correlation functions. We argue that the kinetic theory description becomes less reliable in the presence of this IR enhancement.

### Primary authors

Jarkko Peuron (ECT*) Tuomas Lappi (University of Jyvaskyla) Eero Aleksi Kurkela (CERN) Kirill Boguslavski (Vienna University of Technology (AT))

### Presentation materials

 IS2021.pdf Recording