${{\boldsymbol \Omega}}$ BARYONS($\boldsymbol S$ = $-3$, $\boldsymbol I$ = 0) ${{\mathit \Omega}^{-}}$ = ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$ INSPIRE search

${{\boldsymbol \Omega}^{-}}$ $I(J^P)$ = $0(3/2^{+})$

The unambiguous discovery in both production and decay was by BARNES 1964 . The quantum numbers follow from the assignment of the particle to the baryon decuplet. DEUTSCHMANN 1978 and BAUBILLIER 1978 rule out $\mathit J = 1/2$ and find consistency with $\mathit J = 3/2$. AUBERT,BE 2006 finds from the decay angular distributions of ${{\mathit \Xi}_{{c}}^{0}}$ $\rightarrow$ ${{\mathit \Omega}^{-}}{{\mathit K}^{+}}$ and ${{\mathit \Omega}_{{c}}^{0}}$ $\rightarrow$ ${{\mathit \Omega}^{-}}{{\mathit K}^{+}}$ that $\mathit J = 3/2$; this depends on the spins of the ${{\mathit \Xi}_{{c}}^{0}}$ and ${{\mathit \Omega}_{{c}}^{0}}$ being $\mathit J = 1/2$, their supposed values. We have omitted some results that have been superseded by later experiments. See our earlier editions.
 ${{\mathit \Omega}^{-}}$ MASS $1672.45 \pm0.29$ MeV
 ${{\overline{\mathit \Omega}}^{+}}$ MASS $1672.45 \pm0.29$ MeV
 (${\mathit m}_{{{\mathit \Omega}^{-}}}–{\mathit m}_{{{\overline{\mathit \Omega}}^{+}}}$) $/$ ${\mathit m}_{{{\mathit \Omega}^{-}}}$ $(-1 \pm8) \times 10^{-5}$
 ${{\mathit \Omega}^{-}}$ MEAN LIFE $(8.21 \pm0.11) \times 10^{-11}$ s
 ${{\overline{\mathit \Omega}}^{+}}$ MEAN LIFE $(8.21 \pm0.11) \times 10^{-11}$ s
 (${\mathit \tau}_{{{\mathit \Omega}^{-}}}–{\mathit \tau}_{{{\overline{\mathit \Omega}}^{+}}}$) $/$ ${\mathit \tau}_{{{\mathit \Omega}^{-}}}$ $0.00 \pm0.05$
 ${{\mathit \Omega}^{-}}$ MAGNETIC MOMENT $-2.02 \pm0.05$ $\mu _{\mathit N}$
${{\boldsymbol \Omega}^{-}}$ DECAY PARAMETERS
 $\alpha\mathrm {({{\mathit \Omega}^{-}})}$ $\alpha _{−}({{\mathit \Lambda}}$) FOR ${{\mathit \Omega}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}^{-}}$ $0.0115 \pm0.0015$
 $\alpha$ FOR ${{\mathit \Omega}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}^{-}}$ $0.0157 \pm0.0021$
 $\bar\alpha$ FOR ${{\overline{\mathit \Omega}}^{+}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit K}^{+}}$ $-0.018 \pm0.004$
 ($\alpha$ + $\bar\alpha)/(\alpha −\bar\alpha$) in ${{\mathit \Omega}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}^{-}}$ , ${{\overline{\mathit \Omega}}^{+}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit K}^{+}}$ $-0.02 \pm0.13$
 $\alpha$ FOR ${{\mathit \Omega}^{-}}$ $\rightarrow$ ${{\mathit \Xi}^{0}}{{\mathit \pi}^{-}}$ $0.09 \pm0.14$
 $\alpha$ FOR ${{\mathit \Omega}^{-}}$ $\rightarrow$ ${{\mathit \Xi}^{-}}{{\mathit \pi}^{0}}$ $0.05 \pm0.21$