# Pre-equilibrium Longitudinal Flow in the IP-Glasma Framework for Pb+Pb Collisions at the LHC

## TL;DR

This paper introduces a new implementation of the IP-Glasma model to quantify pre-equilibrium longitudinal flow in Pb+Pb collisions at the LHC, combining it with other models to compare with experimental data and make predictions.

## Contribution

A novel implementation of IP-Glasma that naturally incorporates pre-equilibrium longitudinal flow, enhancing the understanding of initial conditions in heavy-ion collisions.

## Key findings

- Quantified the non-zero pre-equilibrium longitudinal flow in the IP-Glasma model.
- Demonstrated the model's consistency with experimental data.
- Provided predictions for hadronic flow observables at LHC energies.

## Abstract

In this work, we debut a new implementation of IP-Glasma and quantify the pre-equilibrium longitudinal flow in the IP-Glasma framework. The saturation physics based IP-Glasma model naturally provides a non-zero initial longitudinal flow through its pre-equilibrium Yang-Mills evolution. A hybrid IP-Glasma+MUSIC+UrQMD frame- work is employed to test this new implementation against experimental data and to make further predictions about hadronic flow observables in Pb+Pb collisions at 5.02 TeV. Finally, the non-zero pre-equilibrium longitudinal flow of the IP-Glasma model is quantified, and its origin is briefly discussed.