Strange Particle Production in pp collisions at sqrt(s) = 0.9 and 7 TeV

Spectra of strange hadrons have been measured in proton-proton collisions at 0.9 and 7 TeV center-of-mass energies, recorded by the CMS experiment at the CERN Large Hadron Collider. The $\mathrm{K}^0_\mathrm{S}$, $\Lambda^0, \bar \Lambda^0$, and $\Xi^\pm$ particles were reconstructed from their decay topologies and the event yields were measured as a function of the rapidity and the transverse momentum. The measured yields exceed the predictions of current Monte Carlo models.