Measurement of the ratio of Σ0/Λ inclusive production and the Σ0 and Λ polarizations by 28.5 GeV/C protons on beryllium

The ratio of the cross section for Σ0 inclusive production to the cross section for Λ inclusive production has been measured with 28.5 GeV/c protons incident on a beryllium target. The ratio does not depend strongly on the momentum of the produced particle between 10 and 24 GeV/c and is 0.278±0.011±0.050, where the uncertainties are statistical and systematic in that order. The polarization of the Σ0 has been measured with the same data and is found to be opposite to that of the Λ. The polarization of the Λ has also been measured in the transverse momentum range 0.64<pT<1.14 GeV/c and is consistent with previous results