# pQCD-based Approach to Parton Production and Equilibration in High-Energy Nuclear Collisions

## TL;DR

This paper reviews a pQCD-based model for understanding parton production and equilibration in high-energy nuclear collisions, integrating perturbative and nonperturbative processes, and compares predictions with experimental data.

## Contribution

It introduces a comprehensive pQCD-based framework that combines perturbative processes with string phenomenology to model parton dynamics in heavy-ion collisions.

## Key findings

- Model reproduces key features of experimental data.
- Predicts early photon and dilepton signals of parton equilibration.
- Provides insights into jet quenching and quarkonium suppression.

## Abstract

A pQCD-based model for parton production and equilibration in ultrarelativistic heavy-ion collisions is reviewed. The model combines pQCD processes including initial and final state radiations together with string phenomenology for nonperturbative soft processes. Nuclear effects on the initial parton production, such as multiple parton scattering and nuclear shadowing of parton distribution functions are considered. Comparisons with existing data are made and further tests of the model to constrain model parameters are proposed. With the obtained space-time history of the parton production, evolution of the minijet gas toward a fully equilibrated parton plasma is studied. Direct probes of the early parton dynamics, such as pre-equilibrium photon and dilepton production, open charm production, $J/\psi$ suppressionand jet quenching are also reviewed.