Quenching of hadron spectra in XeXe and PbPb collisions at the LHC

Abstract

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 $⟨\overline{ϵ}⟩\propto L^{1.3\pm 0.5}$ with $L\propto A^{1/3}$.

Comments: 4 pages, 2 figures. Proceedings of the Hard Probes 2018 conference