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. 2012 Dec 21;109(25):252301.
doi: 10.1103/PhysRevLett.109.252301. Epub 2012 Dec 18.

Pion, kaon, and proton production in central Pb-Pb collisions at sqrt[s(NN)] = 2.76 TeV

B Abelev  1 J AdamD AdamováA M AdareM M AggarwalG Aglieri RinellaA G AgocsA AgostinelliS Aguilar SalazarZ AhammedN AhmadA Ahmad MasoodiS A AhnS U AhnA AkindinovD AleksandrovB AlessandroR Alfaro MolinaA AliciA AlkinE Almaráz AviñaJ AlmeT AltV AltiniS AltinpinarI AltsybeevC AndreiA AndronicV AnguelovJ AnielskiC AnsonT AntičićF AntinoriP AntonioliL AphecetcheH AppelshäuserN ArborS ArcelliA ArendN ArmestoR ArnaldiT AronssonI C ArseneM ArslandokA AsryanA AugustinusR AverbeckT C AwesJ AystöM D AzmiM BachA BadalàY W BaekR BailhacheR BalaR Baldini FerroliA BaldisseriA BalditF Baltasar dos Santos PedrosaJ BánR C BaralR BarberaF BarileG G BarnaföldiL S BarnbyV BarretJ BartkeM BasileN BastidS BasuB BathenG BatigneB BatyunyaC BaumannI G BeardenH BeckN K BeheraI BelikovF BelliniR BellwiedE Belmont-MorenoG BencediS BeoleI BerceanuA BercuciY BerdnikovD BerenyiA A E BergognonD BerzanoL BetevA BhasinA K BhatiJ BhomL BianchiN BianchiC BianchinJ BielčíkJ BielčíkováA BilandzicS BjelogrlicF BlancoF BlancoD 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Affiliations

Pion, kaon, and proton production in central Pb-Pb collisions at sqrt[s(NN)] = 2.76 TeV

B Abelev et al. Phys Rev Lett. .

Abstract

In this Letter we report the first results on π(±), K(±), p, and p production at midrapidity (|y|<0.5) in central Pb-Pb collisions at sqrt[s(NN)] = 2.76 TeV, measured by the ALICE experiment at the LHC. The p(T) distributions and yields are compared to previous results at sqrt[s(NN)] = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with sqrt[s(NN)], 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.

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