We present an analysis of hadronic multiplicities measured in Pb-Pb collisions at \sqrt s_NN = 2.76 TeV as a function of the collision centrality within the statistical hadronization model. Evidence is found of a dependence of the chemical freeze-out temperature as a function of centrality, with a slow rise from central to peripheral collisions, which we interpret as an effect of post-hadronization inelastic scatterings. Using correction factors calculated by means of a simulation based on the UrQMD model, we are able to obtain a significant improvement in the statitical model fit quality and to reconstruct the primordial chemical equilibrium configuration. This is characterized by a nearly constant temperature of about 164 MeV which we interpret as the actual hadronization temperature.

Centrality dependence of hadronization and chemical freeze-out conditions in heavy ion collisions at sqrt(sNN)=2.76TeV / Becattini, Francesco; Bleicher, Marcus; Grossi, Eduardo; Steinheimer, Jan; Stock, Reinhard. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - STAMPA. - 90:(2014), pp. 054907-054915. [10.1103/PhysRevC.90.054907]

### Centrality dependence of hadronization and chemical freeze-out conditions in heavy ion collisions at sqrt(sNN)=2.76TeV

#### Abstract

We present an analysis of hadronic multiplicities measured in Pb-Pb collisions at \sqrt s_NN = 2.76 TeV as a function of the collision centrality within the statistical hadronization model. Evidence is found of a dependence of the chemical freeze-out temperature as a function of centrality, with a slow rise from central to peripheral collisions, which we interpret as an effect of post-hadronization inelastic scatterings. Using correction factors calculated by means of a simulation based on the UrQMD model, we are able to obtain a significant improvement in the statitical model fit quality and to reconstruct the primordial chemical equilibrium configuration. This is characterized by a nearly constant temperature of about 164 MeV which we interpret as the actual hadronization temperature.
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Becattini, Francesco; Bleicher, Marcus; Grossi, Eduardo; Steinheimer, Jan; Stock, Reinhard
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1002346