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The transverse momentum ($p_{\rm T}$) spectra in proton-proton collisions at$\sqrt{s}$ = 7 TeV, measured by the ALICE experiment at the LHC are analyzedwith a thermodynamically consistent Tsallis distribution. The information aboutthe freeze-out surface in terms of freeze-out volume, temperature and thenon-extenisivity parameter, $q$, for $K^{0}_{S}$, $\Lambda+\bar{\Lambda}$,$\Xi^{-}+\bar{\Xi}^{+}$ and $\Omega^{-}+\bar{\Omega}^{+}$ are extracted byfitting the $p_{\rm T}$ spectra with Tsallis distribution function. Thefreeze-out parameters of these particles are studied as a function of chargedparticle multiplicity density ($dN_{ch}/d\eta$). In addition, we also studythese parameters as a function of particle mass to see any possible massordering. The strange and multi-strange particles show mass ordering in volume,temperature, non-extensive parameter and also a strong dependence onmultiplicity classes. It is observed that with increase in particlemultiplicity, the non-extensivity parameter, $q$ decreases, which indicates thetendency of the produced system towards thermodynamic equilibration. Theincrease in strange particle multiplicity is observed to be due to the increaseof temperature and not to the size of the freeze-out volume.

european physical journal. a, hadrons and nuclei

Multiplicity Dependence of Non-extensive Parameters for Strange and  Multi-Strange Particles in Proton-Proton Collisions at $\sqrt{s}= 7$ TeV at  the LHC