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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.

### Author and article information

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

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