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Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at sqrt(sNN)=2.76 TeV

(ALICE Collaboration) Abelev, B.; Antičić, Tome; Gotovac, Sven; Mudnić, Eugen; Planinić, Mirko; Poljak, Nikola; Simatović, Goran; Šuša, Tatjana; Vicković, Linda; Zyzak, M. (2013) Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at sqrt(sNN)=2.76 TeV. Physics Letters B, 720 (1/3). pp. 52-62. ISSN 0370-2693

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Abstract

The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |η|<0.8 as a function of event centrality in Pb–Pb collisions atsqrt(sNN)=2.76 TeV with ALICE at the LHC. The data are presented in the pT range 0.15<pT<50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor RAA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pT particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with RAA≈0.13 at pT=6–7 GeV/c. Above pT=7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches RAA≈0.4 for pT>30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (RAA=0.6–0.7) and a weak pT dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.

Item Type: Article
Uncontrolled Keywords: particle production; centrality; Pb-Pb; heavy ion; ALICE
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Projects:
Project titleProject leaderProject codeProject type
Experimental physics at LHC energies (Eksperimentalna fizika na LHC energijama)Krešo Kadija098-0982887-2878MZOS
Study of hadronic systems using relativistic projectiles (Istraživanje hadronskih sustava upotrebom relativističkih projektila)Mirko Planinić119-0982887-1006MZOS
Depositing User: Tome Antičić
Date Deposited: 04 Apr 2016 13:22
Last Modified: 09 Jan 2017 12:49
URI: http://fulir.irb.hr/id/eprint/2652
DOI: 10.1016/j.physletb.2013.01.051

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