# Heavy quark diffusion in an overoccupied gluon plasma

- Institution: CERN
- Department: Conferences
- Speaker: Jarkko Peuron
- Year: 2021
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3008977)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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..

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## Lectures

1. [Heavy quark diffusion in an overoccupied gluon plasma](https://invisiblenetwork.ai/learn/cern/3008977/96b7ad9e0e4d), 17 min (CERN's player)