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Volume 345 - International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes2018) - Jets & High-pT Hadrons
Quenching of Hadron Spectra in Heavy Ion Collisions at the LHC
F. Arleo,* G. Falmagne
*corresponding author
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Pre-published on: 2019 February 04
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The $p_{_\perp}$ dependence of the nuclear modification factor $R_{\text{AA}}$ measured in PbPb collisions at the LHC exhibits a universal shape, which can be very well reproduced in a simple energy loss model based on the BDMPS medium-induced gluon spectrum. We update a former study by including in the analysis the recent CMS measurements on $J/\psi$ production in PbPb collisions at $\sqrt{s}=5.02$~TeV and charged hadron production in XeXe collisions at $\sqrt{s}=5.44$~TeV. The average parton energy loss extracted from minimum bias XeXe collisions is reduced typically by 20% compared to PbPb collisions, consistent with a length dependence $\langle\bar{\epsilon}\rangle \propto L^{1.3\pm0.5}$ with $L\propto A^{1/3}$.
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