Centrality dependence of the nuclear modification factor of charged pions, kaons, and protons in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV

Submission Date: 
24/06/2015
Article Information
Submission Form
System: 
Pb-Pb
Energy: 
2.76 TeV
Abstract Plain Text: 

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

PF talk at https://indico.cern.ch/event/306364/contribution/1/material/slides/0.pdf

Aimed at Phys Rev C.