Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at √sNN=2.76 TeV$h

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 at 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 c...

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Hauptverfasser: Abelev, Betty (VerfasserIn) , Angelov, Venelin (VerfasserIn) , Busch, Oliver (VerfasserIn) , Glässel, Peter (VerfasserIn) , Grajcarek, Robert (VerfasserIn) , Herrmann, Norbert (VerfasserIn) , Klein, Jochen (VerfasserIn) , Koch, Kathrin (VerfasserIn) , Krawutschke, Tobias (VerfasserIn) , Kweon, MinJung (VerfasserIn) , Lohner, Daniel (VerfasserIn) , Lu, Xianguo (VerfasserIn) , Maire, Antonin (VerfasserIn) , Mercado Pérez, Jorge (VerfasserIn) , Oyama, Ken (VerfasserIn) , Pachmayer, Yvonne C. (VerfasserIn) , Reygers, Klaus (VerfasserIn) , Schicker, Rainer (VerfasserIn) , Stachel, Johanna (VerfasserIn) , Stiller, Johannes Hendrik (VerfasserIn) , Ulrich, Joachim (VerfasserIn) , Vallero, Sara (VerfasserIn) , Wang, Yifei (VerfasserIn) , Windelband, Bernd (VerfasserIn) , Zimmermann, Alice (VerfasserIn)
Körperschaft: ALICE (VerfasserIn)
Weitere Verfasser: Constantin, Paul (BerichterstatterIn) , Schweda, Kai (BerichterstatterIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 31 January 2013
In: Physics letters
Year: 2013, Jahrgang: 720, Heft: 1/3, Pages: 52-62
ISSN:1873-2445
DOI:10.1016/j.physletb.2013.01.051
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2013.01.051
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0370269313000920
Volltext

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520 |a 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 at 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. 
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