Study of Centrality Dependence of Kinetic Freeze-out Conditions in Pb +   Pb Collisions at Root(sNN)= 2.76 TeV
  The transverse momentum spectra of identified particles at midrapidity in Pb + Pb collisions at Root(sNN) = 2.76 TeV have been studied as a function of collision centrality by using a unified statistical thermal freeze-out model. The calculated results are found to be in good agreement with the experimental data measured by the ALICE experiment at LHC. The model calculations provide the thermal freeze-out conditions in terms of the temperature and collective flow parameters for different particle species. We observe a rise in the thermal freeze-out temperature but a mild decrease in the collective flow velocity parameter from central to peripheral collisions. The model used incorporates the simultaneous effect of the longitudinal as well as transverse hydrodynamic flows. The baryon chemical potential is assumed to be zero ({\mu}B ~ 0), a situation expected in the heavy ion collisions at LHC energies due to a high degree of nuclear transparency. 
Saeed Uddin, Inam-ul Bashir and Riyaz Ahmed Bhat
hep-ph nucl-th