QGP modification to single inclusive jets in a calibrated transport model

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 h AA and single inclusive jets R j AA 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 j AA (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 ∼ 2 GeV/c in jet fragmentation function and jet shape at large r = ∆η 2 + ∆φ 2 are consequences of both soft medium-induced gluon radiation and jet-induced medium excitation.

Parton energy loss in a hard-soft factorized approach

“…15, we compare this numerical result calculated by the current model with the analytical spectrum in Eq. (32). We find that the numerical solution for the medium-induced cascade is reasonably well-described by the approximate analytic solution.…”

“…[13]). A similar program is already being pursued for the energy loss of heavy quarks [31]; studies of light parton energy loss with a model that includes many features of soft-hard factorization, are also ongoing [32].…”

Studying the QGP with Jets at the LHC and RHIC

“…The extraction of q from energy loss measurements was recently performed in Refs. [109,110] using the LIDO and JETSCAPE software, respectively. Both of these papers constrain the models to experimental data by evolving a jet quenching calculation through a 2+1D hydrodynamic evolution (using event-averaged initial conditions).…”

Quantifying the Quark Gluon Plasma

“…The need for systematic and quantitative methods of plausible reasoning to understand heavy-ion collisions was realized, and several works were published in the last ten years [5,6,[32][33][34][35][36][37][38][39], including analyses of both soft hadron production (the topic of this thesis) and hard and electromagnetic probes. This thesis is developed towards a similar pursuit -the robust inference of the properties of quark-gluon plasma.…”