Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at √sNN = 2.76 TeV

Abelev, B. and Antičić, Tome and Gotovac, Sven and Mundić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Šuša, Tatjana and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2013) Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at √sNN = 2.76 TeV. Physics Letters B, 726 (4-5). pp. 610-622. ISSN 0370-2693

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Abstract

We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0–5%, 5–10%, 10–20%, and 20–30% most central events) in Pb–Pb collisions at √sNN = 2.76 TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, −5.0 < η < 5.5, and employing a special analysis technique based on collisions arising from LHC ‘satellite’ bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles (Nch = 17 165 ± 772 for the 0–5% most central collisions). From the measured dNch/dη distribution we derive the rapidity density distribution, dNch/dy, under simple assumptions. The rapidity density distribution is found to be significantly wider than the predictions of the Landau model. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models.

Item Type: Article
Keywords: heavy ion, Pb-Pb, centrality, ALICE
Date: 4 November 2013
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Project code: 098-0982887-2878, 119-0982887-1006
Publisher: Elsevier
Depositing User: Nikola Poljak
Date Deposited: 06 Feb 2015 19:53
Last Modified: 23 Feb 2016 15:12
URI: http://digre.pmf.unizg.hr/id/eprint/3655

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