Polarization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ω</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>hyperons produced in 800 GeV proton-beryllium collisions

The polarization of 103 211 ${\mathrm{\ensuremath{\Omega}}}^{\mathrm{\ensuremath{-}}}$ hyperons produced in 800 GeV proton-beryllium inclusive reactions has been measured. Between 0.3${\mathit{x}}_{\mathit{F}}$0.7 and 0.5${\mathit{p}}_{\mathit{t}}$1.3 GeV/c, the ${\mathrm{\ensuremath{\Omega}}}^{\mathrm{\ensuremath{-}}}$ polarization is found to be consistent with zero, with a mean value of -0.01\ifmmode\pm\else\textpm\fi{}0.01 at 〈${\mathit{x}}_{\mathit{F}}$〉=0.5 and 〈${\mathit{p}}_{\mathit{t}}$〉=0.95 GeV/c. This behavior is similar to that of \ensuremath{\Lambda}${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{0}$, which also does not have any quarks in common with the incident proton, but is different from \ensuremath{\Xi}${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{+}$, which is significantly polarized in the same kinematic region.