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${{\mathit \Xi}}$ 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   JSON PDGID: B050

${{\mathit \Xi}{(1820)}}$ $I(J^P)$ = $1/2(3/2^{-})$

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 [1] $1823$ $\pm5$ MeV

${{\mathit \Xi}{(1820)}}$ WIDTH [1] $24$ $\pm5$ MeV (S = 1.3)

${{\mathit \Xi}{(1820)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \Lambda}}{{\overline{\mathit K}}}$ 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

[1] Our estimate. See the Particle Listings for details.