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Transverse momentum spectra of different particles produced in mid-rapidityinterval in lead-lead (Pb-Pb) collisions with different centrality intervals,measured by the ALICE Collaboration at center-of-mass energy per nucleon pair$\sqrt{s_{NN}}=2.76$ TeV, are conformably and approximately described by theTsallis distribution. The dependences of parameters (effective temperature,entropy index, and normalization factor) on event centrality and particle restmass are obtained. The source temperature at the kinetic freeze-out is obtainedto be the intercept in the linear relation between effective temperature andparticle rest mass, while the particle transverse flow velocity isapproximately extracted to be the slope in the linear relation between meantransverse momentum and particle rest mass. It is shown that the sourcetemperature increases with increase of particle rest mass, which exhibits anevidence of mass dependent differential kinetic freeze-out scenario or multiplekinetic freeze-out scenario.

An Evidence of Mass Dependent Differential Kinetic Freeze-out Scenario Observed in Pb-Pb Collisions at 2.76 TeV