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${{\mathit \Xi}^{-}}$ MASS
$1321.71 \pm0.07$ MeV
${{\overline{\mathit \Xi}}^{+}}$ MASS
$1321.71 \pm0.07$ MeV
(${\mathit m}_{{{\mathit \Xi}^{-}}}{\mathit m}_{{{\overline{\mathit \Xi}}^{+}}}$) $/$ ${\mathit m}_{{{\mathit \Xi}^{-}}}$
$(-3 \pm9) \times 10^{-5}$
${{\mathit \Xi}^{-}}$ MEAN LIFE
$(1.639 \pm0.015) \times 10^{-10}$ s
${{\overline{\mathit \Xi}}^{+}}$ MEAN LIFE
$(1.70 \pm0.14) \times 10^{-10}$ s
(${\mathit \tau}_{{{\mathit \Xi}^{-}}}{\mathit \tau}_{{{\overline{\mathit \Xi}}^{+}}}$) $/$ ${\mathit \tau}_{{{\mathit \Xi}^{-}}}$
$-0.01 \pm0.07$
${{\mathit \Xi}^{-}}$ MAGNETIC MOMENT
$-0.6507 \pm0.0025$ $\mu _{\mathit N}$
${{\overline{\mathit \Xi}}^{+}}$ MAGNETIC MOMENT
$0.657 \pm0.034$ $\mu _{\mathit N}$
(${\mathit \mu}_{{{\mathit \Xi}^{-}}}$ + ${\mathit \mu}_{{{\overline{\mathit \Xi}}^{+}}}$) $/$ $\vert {\mathit \mu}_{{{\mathit \Xi}^{-}}}\vert $
$+0.01 \pm0.05$
$\alpha\mathrm {({{\mathit \Xi}^{-}})}{}\alpha _{−}({{\mathit \Lambda}}$)
$-0.291 \pm0.004$ (S = 1.8)
$\alpha ({{\mathit \Xi}^{-}}$) for ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$
$-0.390 \pm0.007$ (S = 2.0)
$\alpha ({{\overline{\mathit \Xi}}^{+}}$) for ${{\overline{\mathit \Xi}}^{+}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{+}}$
$0.371 \pm0.007$
($\alpha $ + ${{\overline{\mathit \alpha}}}$) $/$ ($\alpha $ $−$ ${{\overline{\mathit \alpha}}}$) for ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$, ${{\overline{\mathit \Xi}}^{+}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{+}}$
$0.006 \pm0.014$
${[\alpha\mathrm {({{\mathit \Xi}^{-}})}\alpha_-({{\mathit \Lambda}}) − \alpha\mathrm {({{\overline{\mathit \Xi}}^{+}})}\alpha_+({{\overline{\mathit \Lambda}}})]\over [\alpha\mathrm {({{\mathit \Xi}^{-}})}\alpha_-({{\mathit \Lambda}}) + \alpha\mathrm {({{\overline{\mathit \Xi}}^{+}})}\alpha_+({{\overline{\mathit \Lambda}}})]}$
$0.0000 \pm0.0007$
$\phi $ ANGLE FOR ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$ (tan$\phi $ = $\beta /\gamma $)
$-1.2 \pm1.0$ $^\circ{}$ (S = 1.4)
$\phi $ ANGLE FOR ${{\overline{\mathit \Xi}}^{+}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{+}}$ (tan$\phi $ = $\beta /\gamma $)
$-1.2 \pm1.2$ $^\circ{}$
$\Delta \Phi _{CP}$ = ($\Phi _{-}$+ $\Phi _{+}$)/2
$-0.3 \pm0.8$ $^\circ{}$
${\mathit g}_{{{\mathit A}}}$ $/$ ${\mathit g}_{{{\mathit V}}}$ FOR ${{\mathit \Xi}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$
$-0.25 \pm0.05$
Mode
Fraction ($\Gamma_i$ / $\Gamma$)
Scale Factor/ Conf. Level
P (MeV/c)
$\Gamma_{1}$ ${{\mathit \Lambda}}{{\mathit \pi}^{-}}$
$(99.887\pm{0.035})\%$
140
$\Gamma_{2}$ ${{\mathit \Sigma}^{-}}{{\mathit \gamma}}$
$(1.27\pm{0.23})\times 10^{-4}$
118
$\Gamma_{3}$ ${{\mathit \Lambda}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$
$(5.63\pm{0.31})\times 10^{-4}$
190
$\Gamma_{4}$ ${{\mathit \Lambda}}{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{{\mu}}}}$
$(3.5^{+3.5}_{-2.2})\times 10^{-4}$
163
$\Gamma_{5}$ ${{\mathit \Sigma}^{0}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$
$(8.7\pm{1.7})\times 10^{-5}$
123
$\Gamma_{6}$ ${{\mathit \Sigma}^{0}}{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{{\mu}}}}$
$<8\times 10^{-4}$
CL=90% 70
$\Gamma_{7}$ ${{\mathit \Xi}^{0}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{{e}}}}$
$<2.59\times 10^{-4}$
CL=90% 7
▸ $\Delta \mathit S$ = 2 forbidden ($\mathit S2$) modes