Influence of scattering versus coherent parton branching on the $k_T$ broadening of QCD cascades in a medium

TL;DR

This paper investigates how different scattering and coherent radiation effects influence the transverse momentum broadening of QCD jets in a medium, revealing a hierarchy of their relative impacts.

Contribution

It introduces a framework combining transverse kicks and medium-induced coherent radiation to study jet evolution and interference effects in a medium.

Findings

Identifies the hierarchy of scattering effects on transverse momentum broadening.

Reproduces BDMPS-Z emission rates through interference effects.

Quantifies the relative importance of different in-medium scatterings.

Abstract

We studied the evolution of jets within a medium that contains both, transverse kicks as well as medium induced coherent radiation. In this framework parton branching occurs simultaneously to scatterings within the medium, leading to the interference effects that reproduce the well known BDMPS-Z emission rates and sizeable transverse momentum broadening. We examined the relative importances of transverse momentum broadening from the coherent splittings and different types of in-medium scatterings and found a clear hierarchy of the influences from different scattering effects and deflections during branchings.