Jet quenching in expanding medium

TL;DR

This paper investigates how different models of expanding quark-gluon plasma affect jet quenching by calculating medium-modified gluon splitting rates and comparing the resulting jet suppression predictions with LHC data.

Contribution

It introduces a detailed calculation of gluon splitting rates in various expanding media using the BDMPSZ formalism and evaluates their impact on jet quenching observables.

Findings

Jet suppression sensitivity varies with medium expansion profile.

Predicted jet $Q_{AA}$ aligns with LHC experimental data.

Different expansion models influence gluon spectra and jet quenching results.

Abstract

Comprehensive understanding of medium-induced radiative energy loss is of a paramount importance in describing observed jet quenching in heavy-ion collisions. In this work, we have calculated the medium-modified gluon splitting rates for different profiles of the expanding partonic medium, namely profiles for static, exponential, and Bjorken expanding medium. Here in this study, we have used the Baier-Dokshitzer-Mueller-Peigne-Schiff-Zakharov (BDMPSZ) formalism for multiple soft scatterings with a time-dependent transport coefficient for characterizing the expanding medium. Using the kinetic rate equation, we have numerically evaluated the distribution of the medium evolved gluon spectra for different medium profiles. We have presented a calculation of the jet $Q_{AA}$ which quantifies a sensitivity of the inclusive jet suppression on the way how the medium expands. Comparisons of predicted jet $Q_{AA}$ with experimental data from the LHC are also presented.