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 $R_{AA}^h$ 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 $r=\sqrt{\Delta {\eta }^2+\Delta {\varphi }^2}$ are consequences of both soft medium-induced gluon radiation and jet-induced medium excitation.

arXiv comment48 pages, 20 figures, prepared for submission

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