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Centrality dependence of π, K, and p production in Pb-Pb collisions at sNN=2.76 TeV

B. Abelev et al. (ALICE Collaboration)
Phys. Rev. C 88, 044910 – Published 15 October 2013

Abstract

In this paper measurements are presented of π±, K±, p, and p¯ production at midrapidity (|y|<0.5), in Pb-Pb collisions at sNN=2.76 TeV as a function of centrality. The measurement covers the transverse-momentum (pT) range from 100, 200, and 300 MeV/c up to 3, 3, and 4.6 GeV/c for π, K, and p, respectively. The measured pT distributions and yields are compared to expectations based on hydrodynamic, thermal and recombination models. The spectral shapes of central collisions show a stronger radial flow than measured at lower energies, which can be described in hydrodynamic models. In peripheral collisions, the pT distributions are not well reproduced by hydrodynamic models. Ratios of integrated particle yields are found to be nearly independent of centrality. The yield of protons normalized to pions is a factor 1.5 lower than the expectation from thermal models.

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  • Received 7 March 2013

DOI:https://doi.org/10.1103/PhysRevC.88.044910

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.

©2013 CERN, for the ALICE Collaboration

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Centrality determination of Pb-Pb collisions at sNN=2.76 TeV with ALICE

B. Abelev et al. (ALICE Collaboration)
Phys. Rev. C 88, 044909 (2013)

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Vol. 88, Iss. 4 — October 2013

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