Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV

Abstract

Transverse momentum ($p_{\mathrm{T}}$) spectra of pions, kaons, and protons up to $p_{\mathrm{T}}=20$ GeV/$c$ have been measured in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV using the ALICE detector for six different centrality classes covering 0-80%. The proton-to-pion and the kaon-to-pion ratios both show a distinct peak at $p_{\mathrm{T}}\approx 3$ GeV/$c$ in central Pb-Pb collisions that decreases towards more peripheral collisions. For $p_{\mathrm{T}}>10$ GeV/$c$, the nuclear modification factor is found to be the same for all three particle species in each centrality interval within systematic uncertainties of 10-20%. This suggests there is no direct interplay between the energy loss in the medium and the particle species composition in the hard core of the quenched jet. For $p_{\mathrm{T}}<10$ GeV/$c$, the data provide important constraints for models aimed at describing the transition from soft to hard physics.

45 pages, 28 captioned figures, 4 tables, authors from page 40, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1649

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