QGP modification to single inclusive jets in a calibrated transport model

TL;DR

This paper presents a calibrated transport model that accurately describes jet suppression and modifications in quark-gluon plasma, elucidating the roles of medium-induced radiation and medium response in jet structure changes.

Contribution

The study introduces a comprehensive transport-based model calibrated to experimental data, providing new insights into jet-medium interactions and jet modification mechanisms in QGP.

Findings

Model reproduces jet suppression factors across different collision energies.

Identifies the origin of soft hadron excess in jet fragmentation.

Elucidates the interplay between parton shower evolution and medium response.

Abstract

We study inclusive jet suppression and modifications in the quark-gluon plasma (QGP) with a transport-based model. The model includes vacuum-like parton shower evolution at high-virtuality, a linearized transport for jet-medium interactions, and a simple ansatz for the jet-induced hydrodynamic response of the medium. Model parameters are calibrated to nuclear modification factors for inclusive hadron $R_{AA}^{h}$ and single inclusive jets $R_{AA}^{j}$ with cone size $R=0.4$ in 0-10% central Au-Au and Pb-Pb collisions measured at the RHIC and LHC. The calibrated model consistently describes the cone-size dependent $R_{AA}^{j}(R)$, modifications to inclusive jet fragmentation functions and jet shape. We discuss the origin of these modifications by analyzing the medium-induced jet energy flow in this model and elucidate the interplay of hard parton evolution and jet-induced medium response. In particular, we demonstrate that the excess of soft hadrons at $p_T\sim 2$ GeV/$c$ in jet fragmentation function and jet shape at large $r=\sqrt{\Delta \eta^2+\Delta \phi^2}$ are consequences of both soft medium-induced gluon radiation and jet-induced medium excitation.