Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at TeV
arXiv:1208.2711 · doi:10.1016/j.physletb.2013.01.051
Abstract
The inclusive transverse momentum () distributions of primary charged particles are measured in the pseudo-rapidity range as a function of event centrality in Pb-Pb collisions at TeV with ALICE at the LHC. The data are presented in the range GeV/ for nine centrality intervals from 70-80% to 0-5%. The Pb-Pb spectra are presented in terms of the nuclear modification factor using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high- particles strongly depends on event centrality. In central collisions (0-5%) the yield is most suppressed with at -7 GeV/. Above GeV/, there is a significant rise in the nuclear modification factor, which reaches for GeV/. In peripheral collisions (70-80%), the suppression is weaker with almost independently of . The measured nuclear modification factors are compared to other measurements and model calculations.
17 pages, 4 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2846
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