Production of charged pions, kaons and protons at large transverse momenta in pp and Pb–Pb collisions at√sNN = 2.76 TeV

ALICE Collaboration, Lee Stuart Barnby, Didier Alexandre, David Evans, Luke Hanratty, Peter Jones, Anton Jusko, Marian Krivda, Graham Lee, Roman Lietava, Patrick Scott, Orlando Villalobos Baillie

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Abstract

Transverse momentum spectra of π±, K± and p(p ̄) up to pT = 20 GeV/c at mid-rapidity in pp, peripheral (60–80%) and central (0–5%) Pb–Pb collisions at √sNN = 2.76 TeV have been measured using the ALICE detector at the Large Hadron Collider. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at pT ≈ 3 GeV/c in central Pb–Pb collisions. Below the peak, pT < 3 GeV/c, both ratios are in good agreement with hydrodynamical calculations, suggesting that the peak itself is dominantly the result of radial flow rather than anomalous hadronization processes. For pT > 10 GeV/c particle ratios in pp and Pb–Pb collisions are in agreement and the nuclear modification factors for π±, K± and p(p ̄) indicate that, within the systematic and statistical uncertainties, the suppression is the same. This suggests that the chemical composition of leading particles from jets in the medium is similar to that of vacuum jets.
Original languageEnglish
Pages (from-to)196-207
Number of pages12
JournalPhysics Letters B
Volume736
Early online date15 Jul 2014
DOIs
Publication statusPublished - 7 Sep 2014

Keywords

  • Identified particle production
  • high-pt
  • particle ratios
  • baryon anomaly
  • nuclear modification factor
  • ALICE
  • LHC

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