${{\boldsymbol \Xi}}$ BARYONS
($\boldsymbol S$ = $-2$, $\boldsymbol I$ = 1/2)
${{\mathit \Xi}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$, ${{\mathit \Xi}^{-}}$ = ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$

INSPIRE search

${{\boldsymbol \Xi}{(2250)}}$ $I(J^P)$ = $1/2(?^{?})$ J, P need confirmation.

The evidence for this state is mixed. BARTSCH 1969 sees a bump of not much statistical significance in ${{\mathit \Lambda}}{{\overline{\mathit K}}}{{\mathit \pi}}$ , ${{\mathit \Sigma}}{{\overline{\mathit K}}}{{\mathit \pi}}$ , and ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$ mass spectra. GOLDWASSER 1970 sees a narrower bump in ${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$ at a higher mass. Not seen by HASSALL 1981 with 45 events/$\mu {\mathrm {b}}$ at 6.5 ${\mathrm {GeV/}}\mathit c$. Seen by JENKINS 1983 . Perhaps seen by BIAGI 1987 .

${{\mathit \Xi}{(2250)}}$ MASS

$\approx2250$ MeV

${{\mathit \Xi}{(2250)}}$ WIDTH

Decay Modes

$\Gamma_{1}$

${{\mathit \Xi}}{{\mathit \pi}}{{\mathit \pi}}$

707

$\Gamma_{2}$

${{\mathit \Lambda}}{{\overline{\mathit K}}}{{\mathit \pi}}$

694

$\Gamma_{3}$

${{\mathit \Sigma}}{{\overline{\mathit K}}}{{\mathit \pi}}$

642