($\alpha $ + $\bar\alpha)/(\alpha −\bar\alpha$) in    ${{\mathit \Omega}^{-}}$   $\rightarrow$   ${{\mathit \Lambda}}{{\mathit K}^{-}}$,    ${{\overline{\mathit \Omega}}^{+}}$   $\rightarrow$   ${{\overline{\mathit \Lambda}}}{{\mathit K}^{+}}$ 
INSPIRE search
 Zero if $\mathit CP$ is conserved.