Abstract
Transverse momentum (pT) spectra of charged particles are measured as a function of event centrality in Pb−Pb collisions at TeV with ALICE at the LHC. The spectra are compared to those measured in pp collisions at the same collision energy in terms of the nuclear modification factor RAA. The high-pT charge particle production in central Pb−Pb collisions (0–5%) is strongly suppressed by a factor ≈6 at transverse momenta pT = 6–7 GeV/c as compared to expectation from independent superposition of nucleon–nucleon collisions. Above pT = 7 GeV/c there is a significant rise in the nuclear modification factor, which reaches RAA ≈ 0.4 at pT = 50 GeV/c. The measured suppression of high-pT particles is stronger than that measured at the RHIC.
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