Charged Particle Production at Large Transverse Momentum in Pb$-$Pb Collisions at $\sqrt{s_{NN}}=2.76$ TeV Measured with ALICE at the LHC

Abstract

Transverse momentum ($p_T$) spectra of charged particles are measured as a function of event centrality in Pb$-$Pb collisions at $\sqrt{s_{NN}}=2.76$ 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 $R_{AA}$. The high-$p_T$ charge particle production in central Pb$-$Pb collisions ($0-5$) is strongly suppressed by a factor $\approx 6$ at transverse momenta $p_T=6-7$ GeV/c as compared to expectation from independent superposition of nucleon-nucleon collisions. Above $p_T=7$ GeV/c there is a significant rise in the nuclear modification factor, which reaches $R_{AA}\approx 0.4$ at $p_T=50$ GeV/c. The measured suppression of high-$p_T$ particles is stronger than that measured at RHIC.

4 pages, 6 figures, Quark Matter 2011 Proceedings

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