Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead–lead collisions at √s[subscript NN] = 2.76 TeV with the ATLAS detector
Author(s)
Taylor, Frank E.
DownloadAad-2012-Measurement of the c.pdf (1.320Mb)
PUBLISHER_CC
Publisher with Creative Commons License
Creative Commons Attribution
Terms of use
Metadata
Show full item recordAbstract
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 √s[subscript NN] = 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, dN[subscript ch]/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 mid-rapidity 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 √s[subscript NN] results. The shape of the dN[subscript ch]/dη distribution is found to be independent of centrality within the systematic uncertainties of the measurement.
Date issued
2012-02Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physics Letters B
Publisher
Elsevier
Citation
Aad, G., B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, O. Abdinov, B. Abi, et al. “Measurement of the Centrality Dependence of the Charged Particle Pseudorapidity Distribution in Lead–lead Collisions at √s[subscript NN] = 2.76 TeV with the ATLAS Detector.” Physics Letters B 710, no. 3 (April 2012): 363–382. © 2012 CERN
Version: Final published version
ISSN
03702693