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

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          Abstract

          Transverse momentum (\(p_{\rm{T}}\)) spectra of pions, kaons, and protons up to \(p_{\rm{T}} = 20\) GeV/\(c\) have been measured in Pb-Pb collisions at \(\sqrt{s_{\rm NN}} = 2.76\) 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 \(p_{\rm{T}} \approx 3\) GeV/\(c\) in central Pb-Pb collisions that decreases towards more peripheral collisions. For \(p_{\rm{T}} > 10\) 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 \(p_{\rm{T}} < 10\) GeV/\(c\), the data provide important constraints for models aimed at describing the transition from soft to hard physics.

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          Author and article information

          Journal
          2015-06-24
          2016-04-09
          10.1103/PhysRevC.93.034913
          1506.07287

          http://creativecommons.org/licenses/by/4.0/

          Custom metadata
          CERN-PH-EP-2015-152
          Phys. Rev. C 93, 034913 (2016)
          45 pages, 28 captioned figures, 4 tables, authors from page 40, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1649
          nucl-ex hep-ex
          Alice Collaboration

          High energy & Particle physics, Nuclear physics

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