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

Preview

PDF - Published Version - article Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (645kB) | Preview

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 title Project leader Project code Project type Experimental physics at LHC energies (Eksperimentalna fizika na LHC energijama) Krešo Kadija 098-0982887-2878 MZOS Study of hadronic systems using relativistic projectiles (Istraživanje hadronskih sustava upotrebom relativističkih projektila) Mirko Planinić 119-0982887-1006 MZOS
Depositing User:	Tome Antičić
Date Deposited:	04 Apr 2016 13:22
URI:	http://fulir.irb.hr/id/eprint/2652
DOI:	10.1016/j.physletb.2013.01.051

Actions (login required)

View Item