Centrality determination of Pb-Pb collisions at sqrt(sNN) = 2.76 TeV with ALICE - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review C Year : 2013

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

B. Abelev
  • Function : Author
B. Cheynis
Maxime Guilbaud
C.S. Roy
Laurent Aphecetche
Guillaume Batigne
B. Erazmus
  • Function : Author
  • PersonId : 1178907
  • IdRef : 033726485
Magali Estienne
Marie Germain
Gines Martinez Garcia
Philippe Pillot
Alexandre Shabetai
Diego Stocco

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 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.

Dates and versions

in2p3-00778545 , version 1 (21-01-2013)

Identifiers

Cite

B. Abelev, C. Cheshkov, B. Cheynis, L. Ducroux, J.-Y. Grossiord, et al.. Centrality determination of Pb-Pb collisions at sqrt(sNN) = 2.76 TeV with ALICE. Physical Review C, 2013, 88, pp.044909. ⟨10.1103/PhysRevC.88.044909⟩. ⟨in2p3-00778545⟩
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