Quark-antiquark antenna splitting in a medium

TL;DR

This paper investigates how a quark-antiquark pair emitting a gluon interacts with a medium, extending previous models to include multiple splittings and reinforcing the jet quenching framework in QCD.

Contribution

It generalizes the analysis of antenna radiation to include two hard splittings within a medium, maintaining the jet quenching paradigm.

Findings

The interaction of the $q\bar{q}g$ system with the medium is characterized by coherence effects.

The model supports the picture of jet quenching with effective emitters in the parton cascade.

The generalization preserves the coherence properties of the antenna in a medium.

Abstract

We study a system in which a quark-antiquark antenna emits a hard gluon in a medium, and an extra very soft emission afterwards. Considering the coherence effects in terms of the survival probability, we can describe the interaction of the $q\bar{q}g$ configuration with the medium. We extrapolate previous analyzes of the antenna radiation to the case of two hard splittings inside the medium, and prove that this generalization keeps back the picture of jet quenching with effective emitters in the parton QCD cascade.