${{\mathit \Xi}}$ BARYONS
($\mathit S$ = $-2$, $\mathit I$ = 1/2)
${{\mathit \Xi}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$, ${{\mathit \Xi}^{-}}$ = ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$ 		INSPIRE   JSON PDGID:
S023

${{\mathit \Xi}^{0}}$

$I(J^P)$ = $1/2(1/2^{+})$ 
The parity has not actually been measured, but ${}^{}{}^{+}$ is of course expected.
See related review:
Radiative Hyperon Decays
${{\mathit \Xi}^{0}}$ MASS   $1314.86 \pm0.20$ MeV 
 
${\mathit m}_{{{\mathit \Xi}^{-}}}–{\mathit m}_{{{\mathit \Xi}^{0}}}$   $6.85 \pm0.21$ MeV 
 
${{\mathit \Xi}^{0}}$ MEAN LIFE   $(2.90 \pm0.09) \times 10^{-10}$ s 
 
${{\mathit \Xi}^{0}}$ MAGNETIC MOMENT   $-1.250 \pm0.014$ $\mu _{\mathit N}$ 
 
${{\mathit \Xi}^{0}}$ DECAY PARAMETERS
$\alpha\mathrm {({{\mathit \Xi}^{0}})}$ $\alpha _{−}({{\mathit \Lambda}}$)   $-0.261 \pm0.006$  
 
$\alpha $ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$   $-0.349 \pm0.009$  
 
$\alpha $ FOR ${{\overline{\mathit \Xi}}^{0}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{0}}$   $0.379 \pm0.004$  
 
$\phi $ ANGLE FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$ (tan$\phi $ = $\beta /\gamma $)   $0.3 \pm0.6$ $^\circ{}$ 
 
$\phi $ ANGLE FOR ${{\overline{\mathit \Xi}}^{0}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{0}}$ with tan ${{\mathit \phi}}$ = ${{\mathit \beta}}/{{\mathit \gamma}}$   $-0.3 \pm0.6$ degrees 
 
$\Delta {{\mathit \phi}_{{{CP}}}}({{\mathit \Xi}^{0}}$) = ( $\phi _{{{\overline{\mathit \Xi}}^{0}}}$ + $\phi _{{{\mathit \Xi}^{0}}}$ )/2   $0.0 \pm0.4$ degrees 
 
$\mathit A_{CP}$ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$, ${{\overline{\mathit \Xi}}^{0}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{0}}$   $-0.005 \pm0.007$  
 
$\alpha $ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \gamma}}$   $-0.70 \pm0.07$  
 
$\alpha $ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{+}}{{\mathit e}^{-}}$   $-0.8 \pm0.2$  
 
$\alpha $ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{0}}{{\mathit \gamma}}$   $-0.69 \pm0.06$  
 
$\mathit g_{1}(0)/\mathit f_{1}$(0) FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$   $1.22 \pm0.05$  
 
$\mathit g_{2}(0)/\mathit f_{1}$(0)) FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$   $-1.7 \pm2.1$  
 
$\mathit f_{2}(0)/\mathit f_{1}$(0) FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$   $2.0 \pm0.9$  
 
$\Gamma_{1}$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$   $(99.524\pm{0.012})\%$ 135
 
$\Gamma_{2}$ ${{\mathit \Lambda}}{{\mathit \gamma}}$   $(1.17\pm{0.07})\times 10^{-3}$ 184
 
$\Gamma_{3}$ ${{\mathit \Lambda}}{{\mathit e}^{+}}{{\mathit e}^{-}}$   $(7.6\pm{0.6})\times 10^{-6}$ 184
 
$\Gamma_{4}$ ${{\mathit \Sigma}^{0}}{{\mathit \gamma}}$   $(3.33\pm{0.10})\times 10^{-3}$ 117
 
$\Gamma_{5}$ ${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$   $(2.52\pm{0.08})\times 10^{-4}$ 120
 
$\Gamma_{6}$ ${{\mathit \Sigma}^{+}}{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{{\mu}}}}$   $(2.33\pm{0.35})\times 10^{-6}$ 64
 
FOOTNOTES
Constrained Fit information