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Abstract

We have analyzed ${\overline{\ensuremath{\Omega}}}^{+}$ and ${\ensuremath{\Omega}}^{\ensuremath{-}}$ events produced in the inclusive reaction $p+\mathrm{Be}\ensuremath{\rightarrow}\ensuremath{\Omega}+X$ and have measured some properties of the ${\overline{\ensuremath{\Omega}}}^{+}$ and ${\ensuremath{\Omega}}^{\ensuremath{-}}$ hyperons via the decay $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\Omega}}\ensuremath{\Lambda}\stackrel{\ensuremath{\rightarrow}}{K}p\ensuremath{\pi}K.$ The measured ${\overline{\ensuremath{\Omega}}}^{+}$ lifetime was ${\ensuremath{\tau}}_{\overline{\ensuremath{\Omega}}}=(0.823\ifmmode\pm\else\textpm\fi{}0.038)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10} \mathrm{s} ({\ensuremath{\chi}}^{2}{/N}_{\mathrm{DF}}=1.52),$ and the measured decay parameter was ${\ensuremath{\alpha}}_{\overline{\ensuremath{\Omega}}}=0.017\ifmmode\pm\else\textpm\fi{}0.077 ({\ensuremath{\chi}}^{2}{/N}_{\mathrm{DF}}=1.74).$ The corresponding values for the ${\ensuremath{\Omega}}^{\ensuremath{-}}$ were ${\ensuremath{\tau}}_{\ensuremath{\Omega}}=(0.817\ifmmode\pm\else\textpm\fi{}0.022)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10} \mathrm{s} ({\ensuremath{\chi}}^{2}{/N}_{\mathrm{DF}}=1.17)$ and ${\ensuremath{\alpha}}_{\ensuremath{\Omega}}=\ensuremath{-}0.028\ifmmode\pm\else\textpm\fi{}0.047 ({\ensuremath{\chi}}^{2}{/N}_{\mathrm{DF}}=1.49).$ In addition, the measurement of the normalized mass difference between the ${\overline{\ensuremath{\Omega}}}^{+}$ and ${\ensuremath{\Omega}}^{\ensuremath{-}}$ yielded $\ensuremath{\Delta}{M}_{\ensuremath{\Omega}}{/M}_{\ensuremath{\Omega}}=(1.44\ifmmode\pm\else\textpm\fi{}7.98)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}.$ The measurements were all in good agreement with CPT invariance.

Measurement of the properties of theΩ¯+andΩ−hyperons

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