Identified charged hadron p_T spectra as a function of multiplicity in pp collisions at √(s) = 7 TeV with ALICE

The intriguing observation of hadron correlations in high-multiplicity pp collisions at the LHC suggests possible collective effects occurring in ''central'' pp collisions. The multiplicity dependence of particle ratios is very sensitivity to various final-state effects like hadronisation, colour reconnection, and collective flow that are implemented in hadronic Monte Carlo models. The ALICE detector provides excellent tracking and particle identification. Charged pions, kaons and (anti-)protons are identified using the TPC specific energy loss (dE/dx) in the momentum range up to about 20 GeV/c. In this talk, the measurements of identified charged hadron spectra (π/K/p) as a function of multiplicity in pp collisions at √(s) = 7 TeV are presented. The multiplicity dependence of the yield ratios is compared to p-Pb and Pb-Pb collisions. In this context, different multiplicity estimators are discussed.