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Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sNN=2.76TeV

K. Aamodt et al. (ALICE Collaboration)
Phys. Rev. Lett. 105, 252301 – Published 13 December 2010

Abstract

The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair sNN=2.76TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section, the pseudorapidity density of primary charged particles at midrapidity is 1584±4(stat)±76(syst), which corresponds to 8.3±0.4(syst) per participating nucleon pair. This represents an increase of about a factor 1.9 relative to pp collisions at similar collision energies, and about a factor 2.2 to central Au-Au collisions at sNN=0.2TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.

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  • Received 19 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.252301

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.

© 2010 CERN, for the ALICE Collaboration

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See Also

Elliptic Flow of Charged Particles in Pb-Pb Collisions at sNN=2.76TeV

K. Aamodt et al. (ALICE Collaboration)
Phys. Rev. Lett. 105, 252302 (2010)

Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sNN=2.76TeV with the ATLAS Detector at the LHC

G. Aad et al. (ATLAS Collaboration)
Phys. Rev. Lett. 105, 252303 (2010)

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Vol. 105, Iss. 25 — 17 December 2010

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