Multi-partonic medium induced cascades in expanding media

TL;DR

This paper develops a comprehensive model of partonic cascades including quarks and gluons in expanding media, analyzing jet quenching phenomena and comparing results with experimental data.

Contribution

It introduces coupled evolution equations for quark and gluon cascades in various expanding media, advancing beyond simplified gluonic models.

Findings

Medium-modified quark and gluon spectra obtained

Jet $R_{AA}$ and $v_2$ calculated and compared with data

Sensitivity analysis of nuclear effects and emission timing

Abstract

Going beyond the simplified gluonic cascades, we introduce both gluon and quark degrees of freedom for partonic cascades inside the medium. We then solve the set of coupled evolution equations numerically with splitting kernels calculated for static, exponential, and Bjorken expanding media to arrive at medium-modified parton spectra for quark and gluon initiated jets. Using these, we calculate the inclusive jet $R_{AA}$ where the phenomenologically driven combinations of quark and gluon jet fractions are included. Then, the rapidity dependence of the jet $R_{AA}$ is examined. We also study the path-length dependence of jet quenching for different types of expanding media by calculating the jet $v_2$. Additionally, we study the sensitivity of observables on effects from nuclear modification of parton distribution functions, vacuum-like emissions in the plasma, and the time of the onset of the quenching. All calculations are compared with recently measured data.