Centrality dependence of charged-particle multiplicity at √(s_NN)=5.02 TeV Pb-Pb collisions measured by ALICE at LHC

The multiplicity of produced particles is an important property of the collisions related to the initial energy density and collision geometry. Its dependence on the collision centrality is sensitive to the interplay between particle production from hard and soft processes and coherence effects between individual nucleon-nucleon scatterings. The Large Hadron Collider (LHC) now operates at a higher energy producing Pb-Pb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. Our work is concentrated on the centrality estimation and the study of the performance of centrality selection using different detector systems in ALICE. We have developed a new framework which allows a dynamic definition of the centrality estimators and allows to perform a run-by-run calibration in a more robust way. We present the centrality dependence of particle production in Pb-Pb collisions at √(s_NN)=5.02 TeV measured by the ALICE experiment with a special emphasis on the event classification in centrality classes and its implications in the interpretation of the nuclear effects.