Strange particle production in proton-antiproton collisions at center-of-mass energies of 630 GeV and 1,800 GeV

The inclusive production of the strange particles Ks0 and Λ has been studied in proton-antiproton collisions at √s = 630 GeV and √s = 1,800 GeV. The inclusive invariant cross-sections, as functions of transverse momentum (pT), are presented for their production in minimum-bias events. The ratio, as a function of pT, of the cross-section for Ks0 to that for charged hadrons is very similar to what is observed at lower energies. At 1,800 GeV, the author estimates the strangeness-suppression factor λ = 0.38 ± 0.06