${{\boldsymbol \Xi}}$ 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 reviews: Radiative Hyperon Decays ${{\mathit \Xi}}$ 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.