Multiplicity and rapidity dependence of strange hadrons spectra in pp, pPb, and PbPb collisions at LHC energies

Measurements of strange hadron ($K^{0}_{s}$, $\Lambda^{+}+\Lambda^{-}$ and $\Xi^{+}+\Xi^{-}$) transverse momentum ($p^{}_{T}$) spectra in pp, pPb and PbPb collisions are presented over a wide range in charge-particle multiplicity and particle rapidity. The data were taken with the CMS detector at the LHC for pp collisions at $\sqrt{s}$ = 7 TeV, pPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV and PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The average transverse kinetic energy ($KE^{}_{T}$) is found to increase with event multiplicity, with a faster rate for heavier particle species. At similar multiplicities, the separation in the $KE^{}_{T}$ between different particle species is observed to be larger for pp and pPb systems than PbPb system. In pPb collisions, the average $KE^{}_{T}$ is found to be larger in the Pb-going direction than in the p-going direction. This trend of asymmetry becomes more evident for heavier particle species as event multiplicity increases. The data are compared to models motivated by hydrodynamics.