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Type: Journal article
Title: Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at √sNN = 2.76 TeV with the ATLAS detector
Other Titles: Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at root sNN = 2.76 TeV with the ATLAS detector
Author: Aad, G.
ATLAS Collaboration
Citation: Physics Letters B: Nuclear Physics and Particle Physics, 2012; 710(3):363-382
Publisher: Elsevier
Issue Date: 2012
ISSN: 0370-2693
Statement of
G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M. J. White ... et al. (ATLAS Collaboration)
Abstract: The ATLAS experiment at the LHC has measured the centrality dependence of charged particle pseudorapidity distributions over |η| < 2 in lead–lead collisions at a nucleon–nucleon centre-of-mass energy of √sNN = 2.76 TeV. In order to include particles with transverse momentum as low as 30 MeV, the data were recorded with the central solenoid magnet off. Charged particles were reconstructed with two algorithms (2-point “tracklets” and full tracks) using information from the pixel detector only. The lead–lead collision centrality was characterized by the total transverse energy in the forward calorimeter in the range 3.2 < |η| < 4.9. Measurements are presented of the per-event charged particle pseudorapidity distribution, dNch/dη, and the average charged particle multiplicity in the pseudorapidity interval |η| < 0.5 in several intervals of collision centrality. The results are compared to previous midrapidity measurements at the LHC and RHIC. The variation of the mid-rapidity charged particle yield per colliding nucleon pair with the number of participants is consistent with lower √sNN results. The shape of the dNch/dη distribution is found to be independent of centrality within the systematic uncertainties of the measurement.
Rights: © 2012 CERN. Published by Elsevier B.V. Open access under CC BY-NC-ND license. []
DOI: 10.1016/j.physletb.2012.02.045
Grant ID: ARC
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