Discrimination of effective radiative and collisional in-medium energy-loss models by their effects on angular jet structure

TL;DR

This paper investigates how different in-medium energy-loss models affect the angular structure of jets in heavy ion collisions, aiming to distinguish between radiative and collisional energy-loss mechanisms.

Contribution

It proposes analyzing the angular jet structure as a new method to differentiate between radiative and collisional energy-loss models in quark-gluon plasma.

Findings

Angular jet structure is sensitive to the underlying energy-loss mechanism.

Different models produce distinguishable modifications in jet angular distributions.

Abstract

Energy-loss studies of hard particle probes produced in heavy ion collisions have often been used to get information on the interactions within the medium of a quark-gluon plasma (QGP). However, with the study of in-medium energy-loss of individual particles alone, it remains still ambiguous, whether the occured decrease in particle energy is caused by predominantly radiative or collisional energy-loss mechanisms. Focusing on the in-medium energy-loss of hard jet-partons, we propose additional studies of the angular jet-structure as a means to further constrain the energy-loss mechanisms.