${{\boldsymbol \Xi}}$ BARYONS ($\boldsymbol S$ = $-2$, $\boldsymbol I$ = 1/2)

${{\mathit \Xi}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$, ${{\mathit \Xi}^{-}}$ = ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$
See related review:
${{\mathit \Xi}}$ Resonances
${{\mathit \Xi}^{0}}$
$1/2^{+ }$ ****
${{\mathit \Xi}^{-}}$
$1/2^{+ }$ ****
${{\mathit \Xi}{(1530)}}$
$3/2^{+ }$ ****
${{\mathit \Xi}{(1620)}}$
*
${{\mathit \Xi}{(1690)}}$
***
${{\mathit \Xi}{(1820)}}$
$3/2^{- }$ ***
${{\mathit \Xi}{(1950)}}$
***
${{\mathit \Xi}{(2030)}}$
${5\over~2}^{? }$ ***
${{\mathit \Xi}{(2120)}}$
*
${{\mathit \Xi}{(2250)}}$
**
${{\mathit \Xi}{(2370)}}$
**
${{\mathit \Xi}{(2500)}}$
*
 
****   Existence is certain, and properties are at least fairly explored.
***   Existence ranges from very likely to certain, but further confirmation is desirable and/or quantum numbers, branching fractions, etc. are not well determined.
**   Evidence of existence is only fair.
*   Evidence of existence is poor.