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Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at root s(NN)=2.76 TeV
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Abelev, B.Adam, J.Adamova, D.Adare, A. M.Aggarwal, M. M.Rinella, G. AglieriAgocs, A. G.Agostinelli, A.Aguilar Salazar, S.Ahammed, Z.Ahmad, N.Masoodi, A. AhmadAhn, S. A.Ahn, S. U.Akindinov, A.Aleksandrov, D.Alessandro, B.Molina, R. AlfaroAlici, A.Alkin, A.Almaraz Avina, E.Alme, J.Alt, T.Altini, V.Altinpinar, S.Altsybeev, I.Andrei, C.Andronic, A.Anguelov, V.Anielski, J.Anson, C.Anticic, T.Antinori, F.Antonioli, P.Aphecetche, L.Appelshaeuser, H.Arbor, N.Arcelli, S.Arend, A.Armesto, N.Arnaldi, R.Aronsson, T.Arsene, I. C.Arslandok, M.Asryan, A.Augustinus, A.Averbeck, R.Awes, T. C.Aysto, J.Azmi, M. D.Bach, M.Badala, A.Baek, Y. W.Bailhache, R.Bala, R.Ferroli, R. BaldiniBaldisseri, A.Baldit, A.Pedrosa, F. Baltasar Dos SantosBan, J.Baral, R. C.Barbera, R.Barile, F.Barnafoeldi, C. G.Barnby, L. S.Barret, V.Bartke, J.Basile, M.Bastid, N.Basu, S.Bathen, B.Batigne, G.Batyunya, B.Baumann, C.Bearden, I. G.Beck, H.Behera, N. 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L.Chattopadhyay, S.Chawla, I.Cherney, M.Cheshkov, C.Cheynis, B.Barroso, V. ChibanteChinellato, D. D.Chochula, P.Chojnacki, M.Choudhury, S.Christakoglou, P.Christensen, C. H.Christiansen, PeterChujo, T.Chung, S. U.Cicalo, C.Cifarelli, L.Cindolo, F.Cleymans, J.Coccetti, F.Colamaria, F.Colella, D.Balbastre, G. Conesadel Valle, Z. ConesaConstantin, P.Contin, G.Contreras, J. G.Cormier, T. M.Morales, Y. CorralesCortese, P.Cortes Maldonado, I.Cosentino, M. R.Costa, F.Cotallo, M. E.Crescio, E.Crochet, P.Cruz Alaniz, E.Cuautle, E.Cunqueiro, L.Dainese, A.Dalsgaard, H. H.Danu, A.Das, D.Das, I.Das, K.Dash, A.Dash, S.De, S.de Barros, G. O. V.De Caro, A.de Cataldo, G.de Cuveland, J.De Falco, A.De Gruttola, D.Delagrange, H.Deloff, A.Demanov, V.De Marco, N.Denes, E.De Pasquale, S.Deppman, A.Erasmo, G. D.de Rooij, R.Diaz Corchero, M. 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Source
Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 720(1-3):52-62
Subject
Naturvetenskap
Fysik
Subatomär fysik
Natural Sciences
Physical Sciences
Subatomic Physics
Language
English
ISSN
0370-2693
Abstract
The inclusive transverse momentum (p(T)) distributions of primary charged particles are measured in the pseudo-rapidity range vertical bar eta vertical bar <0.8 as a function of event centrality in Pb-Pb collisions at root S-NN = 2.76 TeV with ALICE at the LHC. The data are presented in the p(T) range 0.15 < p(T) <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 R-AA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-p(T) particles strongly depends on event centrality. The yield is most suppressed in central collisions (0-5%) with R-AA approximate to 0.13 at p(T) = 6-7 GeV/c. Above p(T) = 7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches R-AA approximate to 0.4 for p(T) > 30 GeV/c. In peripheral collisions (70-80%), only moderate suppression (R-AA approximate to 0.6-0.7) and a weak p(T) dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations. (C) 2013 CERN. Published by Elsevier B.V. All rights reserved.