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Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at √ s NN = 2.76 TeV
ALICE Collaboration Adam, J. Tapia Takaki, Daniel
ALICE Collaboration
Adam, J.
Tapia Takaki, Daniel
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Abstract
Transverse momentum (pT) spectra of pions, kaons, and protons up to pT=20 GeV/c have been measured in Pb-Pb collisions at √sNN=2.76 TeV 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 pT≈3 GeV/c in central Pb-Pb collisions that decreases for more peripheral collisions. For pT>10 GeV/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<10 GeV/c, the data provide important constraints for models aimed at describing the transition from soft to hard physics.
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2016-03-25
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American Physical Society
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J. Adam et al. ALICE Collaboration. Phys. Rev. C 93, 034913 (2016) https://doi.org/10.1103/PhysRevC.93.034913