pdgLive

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

INSPIRE JSON PDGID:

${{\mathit \Omega}_{{{b}}}^{-}}$

$I(J^P)$ = $0(1/2^{+})$ I, J, P need confirmation.

In the quark model ${{\mathit \Omega}_{{{b}}}^{-}}$ is $\mathit ssb$ ground state. None of its quantum numbers has been measured.

${{\mathit \Omega}_{{{b}}}^{-}}$ MASS

$6045.8$ $\pm0.8$ MeV

${\mathit m}_{{{\mathit \Omega}_{{{b}}}^{-}}}-{\mathit m}_{{{\mathit \Lambda}_{{{b}}}^{0}}}$

$426.4$ $\pm2.2$ MeV

${\mathit m}_{{{\mathit \Omega}_{{{b}}}^{-}}}-{\mathit m}_{{{\mathit \Xi}_{{{b}}}^{-}}}$

$248.5$ $\pm0.6$ MeV

${{\mathit \Omega}_{{{b}}}}$ MEAN LIFE

($1.64$ $\pm0.16$) $ \times 10^{-12}$ s

$\tau ({{\mathit \Omega}_{{{b}}}^{-}})/\tau ({{\mathit \Xi}_{{{b}}}^{-}}$) mean life ratio

$1.11$ $\pm0.16$

${{\mathit \Omega}_{{{b}}}^{-}}$ DECAY MODES

Mode

Fraction ($\Gamma_i$ / $\Gamma$)

Scale Factor/
Conf. Level

P(MeV/c)

${{\mathit J / \psi}}{{\mathit \Omega}^{-}}$ ${\times }B({{\mathit b}}$ $\rightarrow$ ${{\mathit \Omega}_{{{b}}}}$)

($1.4^{+0.5}_{-0.4}$) $ \times 10^{-6}$

${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}$ ${\times }B({{\overline{\mathit b}}}$ $\rightarrow$ ${{\mathit \Omega}_{{{b}}}}$)

$<2.3$ $\times 10^{-9}$

${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ ${\times }B({{\overline{\mathit b}}}$ $\rightarrow$ ${{\mathit \Omega}_{{{b}}}}$)

$<1.5$ $\times 10^{-8}$

${{\mathit p}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}$ ${\times }B({{\overline{\mathit b}}}$ $\rightarrow$ ${{\mathit \Omega}_{{{b}}}}$)

$<7$ $\times 10^{-9}$

${{\mathit \Omega}_{{{c}}}^{0}}{{\mathit \pi}^{-}}$

${{\mathit \Omega}_{{{c}}}^{0}}{{\mathit \pi}^{-}}$ , ${{\mathit \Omega}_{{{c}}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$

${{\mathit \Xi}_{{{c}}}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}$

${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit K}^{-}}{{\mathit K}^{-}}$

${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}$

${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$

Except where otherwise noted, content of the 2025 Review of Particle Physics is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2025. See LBNL disclaimers.