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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 ofcollision centrality by using a unified statistical thermal freeze-out model.The calculated results are found to be in good agreement with the experimentaldata measured by the ALICE experiment at LHC. The model calculations providethe thermal freeze-out conditions in terms of the temperature and collectiveflow parameters for different particle species. We observe a rise in thethermal freeze-out temperature but a mild decrease in the collective flowvelocity parameter from central to peripheral collisions. The model usedincorporates the simultaneous effect of the longitudinal as well as transversehydrodynamic 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 ahigh degree of nuclear transparency.

Study of Centrality Dependence of Kinetic Freeze-out Conditions in Pb + Pb Collisions at Root(sNN)= 2.76 TeV