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We present an analysis of hadronic multiplicities measured in Pb-Pbcollisions at \sqrt s_{NN} = 2.76 TeV as a function of the collision centralitywithin the statistical hadronization model. Evidence is found of a dependenceof the chemical freeze-out temperature as a function of centrality, with a slowrise from central to peripheral collisions, which we interpret as an effect ofpost-hadronization inelastic scatterings. Using correction factors calculatedby means of a simulation based on the UrQMD model, we are able to obtain asignificant improvement in the statitical model fit quality and to reconstructthe primordial chemical equilibrium configuration. This is characterized by anearly constant temperature of about 164 MeV which we interpret as the actualhadronization temperature.

Centrality dependence of hadronization and chemical freeze-out conditions in heavy ion collisions at \sqrt s_{NN} = 2.76 TeV