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${{\mathit \Xi}}$ 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 (beta) PDGID:

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

$I(J^P)$ = $1/2(1/2^{+})$

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 ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$

$-0.349 \pm0.009$

$\phi $ ANGLE FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$ (tan$\phi $ = $\beta /\gamma $)

$21 \pm12$ $^\circ{}$

$\alpha $ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \gamma}}$

$-0.70 \pm0.07$

$\alpha $ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{+}}{{\mathit e}^{-}}$

$\alpha $ FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{0}}{{\mathit \gamma}}$

$-0.69 \pm0.06$

$\mathit g_{1}(0)/\mathit f_{1}$(0) FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$

$\mathit g_{2}(0)/\mathit f_{1}$(0)) FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$

$\mathit f_{2}(0)/\mathit f_{1}$(0) FOR ${{\mathit \Xi}^{0}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$

${{\mathit \Xi}^{0}}$ DECAY MODES ▸ Expand all decays

${{\mathit \Lambda}}{{\mathit \pi}^{0}}$

$(99.524\pm{0.012})\%$

${{\mathit \Lambda}}{{\mathit \gamma}}$

$(1.17\pm{0.07})\times 10^{-3}$

${{\mathit \Lambda}}{{\mathit e}^{+}}{{\mathit e}^{-}}$

$(7.6\pm{0.6})\times 10^{-6}$

${{\mathit \Sigma}^{0}}{{\mathit \gamma}}$

$(3.33\pm{0.10})\times 10^{-3}$

${{\mathit \Sigma}^{+}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$

$(2.52\pm{0.08})\times 10^{-4}$

${{\mathit \Sigma}^{+}}{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{\mu}}}$

$(2.33\pm{0.35})\times 10^{-6}$

▸	$\Delta \mathit S$ = $\Delta \mathit Q$ ($\mathit SQ$) violating modes or $\Delta \mathit S$ = 2 forbidden ($\mathit S2$) modes

FOOTNOTES

Constrained Fit information

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