The ratio of the cross section for Σ0 inclusive production to the cross section for Λ0 inclusive production has been measured with 28.5 GeV/c protons incident on a beryllium target at an average laboratory production angle of 4°. This ratio was measured to be 0.278±0.011±0.05 where the uncertainties are statistical and systematic in that order. The ratio does not depend strongly on the momentum of the produced particle between 10 and 24 GeV/c. The effect of Σ0 contamination on previous determinations of the polarization of inclusively produced Λ0's is discussed.
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We would like to thank the Director and staff of the Brookhaven National Laboratory for their invaluable assistance. The University of Massachusetts Computer Center is also to be thanked. We are indebted to our colleagues at the University of California at Santa Barbara for the loan of some lead glass blocks. The work was supported in part by the US National Science Foundation and the US Department of Energy.