# Bottom-up thermalization in heavy ion collisions

## TL;DR

This paper explains how thermalization occurs in heavy ion collisions using perturbative QCD, detailing the timescale and temperature achieved when the saturation scale is large.

## Contribution

It provides a theoretical description of thermalization dynamics in heavy ion collisions within the perturbative QCD framework, including specific timescale and temperature estimates.

## Key findings

- Thermalization occurs in a time of order α^{-13/5} Q_s^{-1}.
- Maximum temperature achieved is approximately α^{2/5} Q_s.
- Applicable when the saturation scale Q_s is large compared to Λ_QCD.

## Abstract

We describe how thermalization occurs in heavy ion collisions in the framework of perturbative QCD. When the saturation scale $Q_s$ is large compared to $\Lambda_{QCD}$, thermalization takes place during a time of order $\alpha^{-13/5}Q_s^{-1}$ and the maximal temperature achieved is $\alpha^{2/5}Q_s$.