Identified charged pion, kaon, and proton production in pp and Pb-Pb collisions at LHC energies measured with ALICE

ALICE has unique capabilities among the LHC experiments for particle identification (PID) at mid-rapidity ( j h j < 0 : 9) over a wide range of transverse momentum ( p T ). For p T from 100 MeV/ c up to 3-4 GeV/ c (anti)protons, charged pions and kaons can be separated on a track-by- track basis through the measurement of the specific energy loss, d E /d x , and the time of flight. The identification of protons can be extended up to 6 GeV/ c by the Cherenkov detector. For 3 < p T < 20 GeV/ c , statistical PID can be done thanks to the relativistic rise of the d E /d x in the TPC. In this report, the spectra for charged pions, kaons, and (anti)protons from pp (at p s = 2 : 76 and 7 TeV) and Pb-Pb (at p s NN = 2 : 76 TeV) collisions will be presented. The results from pp collisions are important both as a baseline for Pb-Pb measurements and for our understanding of the hadronization process with a focus here on jet fragmentation at high p T . The intermediate p T region is interesting due to the anomalous large peak in the proton to pion ratio that can be an indication for new hadronization processes in Pb-Pb such as recombination.