Observation ofΩ−Production ine+e−Annihilation at 29 GeV

Abstract

Inclusive ${\Omega }^{-}$ production in $e^{+}{e}^{-}$ annihilation at 29 GeV has been measured with the Mark II detector. From an integrated luminosity of 207 ${\mathrm{pb}}^{-1\mathrm{}}$, we determine a production rate of 0.014±0.006±0.004 ${\Omega }^{-}$, ${\overline{\Omega }}^{+}$ per hadronic event. This is roughly 35 times the Lund-model prediction of 0.0004 ${\Omega }^{-}$, ${\overline{\Omega }}^{+}$ per hadronic event, but comparable to the Webber-model prediction of 0.006 ${\Omega }^{-}$, ${\overline{\Omega }}^{+}$ per hadronic event. The large rate of ${\Omega }^{-}$ production, compared with production rates for other baryons, and with theoretical predictions based on diquark models, indicates that spin suppression does not hold for ${\Omega }^{-}$ production.