• Open Access

Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at sNN=2.76 TeV

J. Adam et al. (ALICE Collaboration)
Phys. Rev. C 93, 034913 – Published 25 March 2016

Abstract

Transverse momentum (pT) spectra of pions, kaons, and protons up to pT=20GeV/c have been measured in Pb-Pb collisions at sNN=2.76TeV using the ALICE detector for six different centrality classes covering 0%–80%. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT3GeV/c in central Pb-Pb collisions that decreases for more peripheral collisions. For pT>10GeV/c, the nuclear modification factor is found to be the same for all three particle species in each centrality interval within systematic uncertainties of 10%–20%. This suggests there is no direct interplay between the energy loss in the medium and the particle species composition in the hard core of the quenched jet. For pT<10GeV/c, the data provide important constraints for models aimed at describing the transition from soft to hard physics.

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  • Received 7 July 2015
  • Revised 9 November 2015

DOI:https://doi.org/10.1103/PhysRevC.93.034913

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

©2016 CERN, for the ALICE Collaboration

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 93, Iss. 3 — March 2016

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