Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at √sNN=2.76  TeV

Peter Jones, Lee Stuart Barnby, David Evans, Luke Hanratty, Anton Jusko, Ravjeet Kour, Marian Krivda, Cristina Lazzeroni, Graham Lee, Roman Lietava, Zoe Matthews, Sparsh Navin, Arvinder Palaha, Plamen Petrov, Patrick Scott, Orlando Villalobos Baillie, Graham Lee

Research output: Contribution to journalArticlepeer-review

180 Citations (Scopus)


In this Letter we report the first results on π±, K±, p, and p̅ production at midrapidity (|y|<0.5) in central Pb-Pb collisions at √sNN=2.76  TeV, measured by the ALICE experiment at the LHC. The pT distributions and yields are compared to previous results at √sNN=200  GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with √sNN, which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/π ratio is in line with predictions from the thermal model, the p/π ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood.
Original languageEnglish
Article number252301
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 21 Dec 2012


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