Comparative multi-probe study of jet energy-loss in QGP

TL;DR

This paper compares two models of jet energy loss in Quark-Gluon Plasma using the JETSCAPE framework, highlighting the role of jet-medium photons and providing new full jet simulations with substructure observables.

Contribution

It integrates CUJET into JETSCAPE for the first time and performs comprehensive simulations including jet substructure and photon contributions.

Findings

Jet-medium photons significantly affect intermediate $p_T$ observables.

Full jet simulations with substructure are now feasible within this framework.

Comparison of CUJET and MARTINI models provides insights into jet quenching mechanisms.

Abstract

Jet-energy loss is an important sign of the creation of Quark-Gluon Plasma in heavy-ion collisions. High transverse momentum ($p_T$) partons are produced at the moment of initial hard scattering and are modified as a result of their propagation through the created medium. We study two models of low-virtuality radiative energy loss: CUJET and MARTINI. This is done using the JETSCAPE framework, which allows for an objective comparison. CUJET is integrated into the JETSCAPE workflow, and full jet simulations, including substructure observables, are computed for the first time using leading-order DGLV rates. Strongly-interacting probes (charged hadrons, jets, jet fragmentation functions and jet shape ratio) are considered along jet-medium photons for the first time in a dynamic QGP. We find that these photons make a significant contribution in the phenomenologically interesting intermediate $p_T$ domain of $4$-$12$ GeV.