Abstract
We have measured the polarization P, the analyzing power A, and the polarization transfer D of ${\ensuremath{\Sigma}}^{0}$'s produced inclusively by a polarized proton beam at 18.5 GeV/c. Our data cover a region of moderate ${p}_{T}$ (average 1 GeV/c) and Feynman x up to 0.75. We find agreement with a previous measurement of the ${\ensuremath{\Sigma}}^{0}$ polarization P. We observe nonzero values for A and D, but they are significantly smaller than predictions based on a simple parton-recombination model. We have extended this model to include finite transversity spin flips, which improves agreement with the data considerably.
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