${{\mathit \Xi}}$ 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 search

${{\boldsymbol \Xi}{(1820)}}$

$I(J^P)$ = $1/2(3/2^{-})$ 
The clearest evidence is an 8-standard-deviation peak in ${{\mathit \Lambda}}{{\mathit K}^{-}}$ seen by GAY 1976C. TEODORO 1978 favors $\mathit J = 3/2$, but cannot make a parity discrimination. BIAGI 1987C is consistent with $\mathit J = 3/2$ and favors negative parity for this $\mathit J$ value.
${{\mathit \Xi}{(1820)}}$ MASS   $1823 \pm5$ MeV 
 
${{\mathit \Xi}{(1820)}}$ WIDTH   $24 {}^{+15}_{-10}$ MeV 
 
$\Gamma_{1}$ ${{\mathit \Lambda}}{{\overline{\mathit K}}}$  $large$ 402
 
$\Gamma_{2}$ ${{\mathit \Sigma}}{{\overline{\mathit K}}}$  $small$ 324
 
$\Gamma_{3}$ ${{\mathit \Xi}}{{\mathit \pi}}$  $small$ 421
 
$\Gamma_{4}$ ${{\mathit \Xi}{(1530)}}{{\mathit \pi}}$  $small$ 237
 
$\Gamma_{5}$ ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$ (not ${{\mathit \Xi}{(1530)}}{{\mathit \pi}}$)  369
 
FOOTNOTES