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BOTTOM BARYONS ($\mathit B$ = $-1$) ${{\mathit \Lambda}_{{b}}^{0}}$ = ${{\mathit u}}{{\mathit d}}{{\mathit b}}$ , ${{\mathit \Xi}_{{b}}^{0}}$ = ${{\mathit u}}{{\mathit s}}{{\mathit b}}$ , ${{\mathit \Xi}_{{b}}^{-}}$ = ${{\mathit d}}{{\mathit s}}{{\mathit b}}$ , ${{\mathit \Omega}_{{b}}^{-}}$ = ${{\mathit s}}{{\mathit s}}{{\mathit b}}$

INSPIRE

${{\mathit \Sigma}_{{b}}}$ $I(J^P)$ = $1(1/2^{+})$ I, J, P need confirmation.

In the quark model ${{\mathit \Sigma}_{{b}}^{+}}$ , ${{\mathit \Sigma}_{{b}}^{0}}$ , ${{\mathit \Sigma}_{{b}}^{-}}$ are an isotriplet ($\mathit uub$, $\mathit udb$, $\mathit ddb$) state. The lowest ${{\mathit \Sigma}_{{b}}}$ ought to have $\mathit J{}^{P} = 1/2{}^{+}$. None of $\mathit I,~J$, or $\mathit P$ have actually been measured.

${{\mathit \Sigma}_{{b}}}$ MASS

${{\mathit \Sigma}_{{b}}^{+}}$ MASS   $5810.56 \pm0.25$ MeV

${{\mathit \Sigma}_{{b}}^{-}}$ MASS   $5815.64 \pm0.27$ MeV

${\mathit m}_{{{\mathit \Sigma}_{{b}}^{+}}}–{\mathit m}_{{{\mathit \Sigma}_{{b}}^{-}}}$   $-5.06 \pm0.18$ MeV

${{\mathit \Sigma}_{{b}}}$ WIDTH

${{\mathit \Sigma}_{{b}}^{+}}$ WIDTH   $5.0 \pm0.5$ MeV

${{\mathit \Sigma}_{{b}}^{-}}$ WIDTH   $5.3 \pm0.5$ MeV

${{\mathit \Sigma}_{{b}}}$ Decay Modes
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \Lambda}_{{b}}^{0}}{{\mathit \pi}}$   $dominant$ 133
FOOTNOTES