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CMS_2011_S8978280

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The spectra of KS, Λ, and Cascade- particles were measured versus transverse-momentum (p) and rapidity (y) in proton-proton collisions at center-of-mass energies 900 and 7000 GeV. The production is normalized to all non-single-diffractive (NSD) events using corrections for trigger and selection efficiency, acceptance, and branching ratios. The results cover a rapidity range of |y|<2 and a p range from 0 to 10 GeV (KS and Λ) and 0 to 6 GeV (Cascade-). Antiparticles are included in all measurements so only the sums of Λ and ˉΛ, and Cascade and anti-Cascade are given. The rapidity distributions are shown versus |y| but normalized to a unit of y. Ratios of Λ/KS and Cascade/Λ production versus p and |y| are also given, with somewhat smaller systematic uncertainties than obtained from taking the ratio of the individual distributions.' The data were corrected according to the SD/DD/ND content of the CMS trigger, as predicted by PYTHIA6. The uncertainties connected with correct or uncorrect modelling of diffraction were included in the systematic errors.

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