• Open Access

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

B. Abelev et al. (ALICE Collaboration)
Phys. Rev. C 88, 044909 – Published 15 October 2013

Abstract

This publication describes the methods used to measure the centrality of inelastic Pb-Pb collisions at a center-of-mass energy of 2.76 TeV per colliding nucleon pair with ALICE. The centrality is a key parameter in the study of the properties of QCD matter at extreme temperature and energy density, because it is directly related to the initial overlap region of the colliding nuclei. Geometrical properties of the collision, such as the number of participating nucleons and the number of binary nucleon-nucleon collisions, are deduced from a Glauber model with a sharp impact parameter selection and shown to be consistent with those extracted from the data. The centrality determination provides a tool to compare ALICE measurements with those of other experiments and with theoretical calculations.

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  • Received 22 January 2013

DOI:https://doi.org/10.1103/PhysRevC.88.044909

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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See Also

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 (2013)

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Vol. 88, Iss. 4 — October 2013

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