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

# ${{\boldsymbol \Lambda}_{{b}}^{0}}$ $I(J^P)$ = $0(1/2^{+})$

In the quark model, a ${{\mathit \Lambda}_{{b}}^{0}}$ is an isospin-0 ${{\mathit u}}{{\mathit d}}{{\mathit b}}$ state. The lowest ${{\mathit \Lambda}_{{b}}^{0}}$ ought to have $\mathit J{}^{P} = 1/2{}^{+}$. None of $\mathit I$, $\mathit J$, or $\mathit P$ have actually been measured.
${{\boldsymbol \Lambda}_{{b}}^{0}}$ MASS
 ${\mathit m}_{{{\mathit \Lambda}_{{b}}^{0}}}$ $5619.60 \pm0.17$ MeV
 ${\mathit m}_{{{\mathit \Lambda}_{{b}}^{0}}}–{\mathit m}_{{{\mathit B}^{0}}}$ $339.2 \pm1.4$ MeV
 ${\mathit m}_{{{\mathit \Lambda}_{{b}}^{0}}}–{\mathit m}_{{{\mathit B}^{+}}}$ $339.72 \pm0.28$ MeV
 ${{\mathit \Lambda}_{{b}}^{0}}$ MEAN LIFE $(1.470 \pm0.010) \times 10^{-12}$ s
 ${\mathit \tau}_{{{\mathit \Lambda}_{{b}}^{0}}}/{\mathit \tau}_{{{\overline{\mathit \Lambda}}_{{b}}^{0}}}$ $0.94 \pm0.04$
${\boldsymbol \tau}_{{{\boldsymbol \Lambda}_{{b}}^{0}}}/{\boldsymbol \tau}_{{{\boldsymbol B}^{0}}}$ MEAN LIFE RATIO
 ${\mathit \tau}_{{{\mathit \Lambda}_{{b}}^{0}}}/{\mathit \tau}_{{{\mathit B}^{0}}}$ (direct measurements) $0.964 \pm0.007$
PARTIAL BRANCHING FRACTIONS IN ${{\boldsymbol \Lambda}_{{b}}}$ $\rightarrow$ ${{\boldsymbol \Lambda}}{{\boldsymbol \mu}^{+}}{{\boldsymbol \mu}^{-}}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (q${}^{2}<$ 2.0 GeV${}^{2}$/c${}^{4}$) $(7.1 \pm2.7) \times 10^{-8}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (2.0 $<$ q${}^{2}<$ 4.3 GeV${}^{2}$/c${}^{4}$) $(2.8 {}^{+2.8}_{-2.1}) \times 10^{-8}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (q${}^{2}<$ 4.3 GeV${}^{2}$/c${}^{4}$) $(2.7 \pm2.7) \times 10^{-7}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (4.0 $<$ q${}^{2}<$ 6.0 GeV${}^{2}$/c${}^{4}$) $(0.4 {}^{+1.81}_{-0.20}) \times 10^{-8}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (1.0 $<$ q${}^{2}<$ 6.0 GeV${}^{2}$/c${}^{4}$) $(4.7 {}^{+3.1}_{-2.7}) \times 10^{-8}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (6.0 $<$ q${}^{2}<$ 8.0 GeV${}^{2}$/c${}^{4}$) $(5.0 \pm2.5) \times 10^{-8}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (4.3 $<$ q${}^{2}<$ 8.68 GeV${}^{2}$/c${}^{4}$) $(5 \pm7) \times 10^{-8}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (10.09 $<$ q${}^{2}<$ 12.86 GeV${}^{2}$/c${}^{4}$) $(2.2 \pm0.6) \times 10^{-7}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (14.18 $<$ q${}^{2}<$ 16.0 GeV${}^{2}$/c${}^{4}$) $(1.7 \pm0.5) \times 10^{-7}$  (S = 1.1)
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (16.0 $<$ q${}^{2}$ GeV${}^{2}$/c${}^{4}$) $(7.0 \pm2.9) \times 10^{-7}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (18.0 $<$ q${}^{2}<$ 20.0 GeV${}^{2}$/c${}^{4}$) $(2.4 \pm0.6) \times 10^{-7}$
 B( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) (15.0 $<$ q${}^{2}<$ 20.0 GeV${}^{2}$/c${}^{4}$) $(6.0 \pm1.3) \times 10^{-7}$
$\boldsymbol CP$ VIOLATION
 $\mathit A_{CP}$( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ ) $0.06 \pm0.08$
 $\mathit A_{CP}$( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}$ ) $-0.10 \pm0.09$
 $\mathit A_{CP}$( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit K}}^{0}}{{\mathit \pi}^{-}}$ ) $0.22 \pm0.13$
 $\Delta \mathit A_{CP}$( ${{\mathit J / \psi}}{{\mathit p}}{{\mathit \pi}^{-}}$ $/$ ${{\mathit K}^{-}}$ ) ${}\equiv$ $\mathit A_{CP}$( ${{\mathit J / \psi}}{{\mathit p}}{{\mathit \pi}^{-}}$ ) $−$ $\mathit A_{CP}$( ${{\mathit J / \psi}}{{\mathit p}}{{\mathit K}^{-}}$ ) $0.057 \pm0.027$
 $\mathit A_{CP}$( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}^{+}}{{\mathit \pi}^{-}}$ ) $-0.53 \pm0.25$
 $\mathit A_{CP}$( ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}^{+}}{{\mathit K}^{-}}$ ) $-0.28 \pm0.12$
 $\Delta \mathit A_{CP}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) ${}\equiv$ $\mathit A_{CP}$( ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) $−$ $\mathit A_{CP}$( ${{\mathit p}}{{\mathit K}^{-}}{{\mathit J / \psi}}$ ) $-0.04 \pm0.05$
 $\mathit CP$ AND $\mathit T$ VIOLATION PARAMETERS
 ${{\mathit A}}_{c}({{\mathit \Lambda}}$) $-0.22 \pm0.13$
 ${{\mathit A}}_{s}({{\mathit \Lambda}}$) $0.13 \pm0.13$
 ${{\mathit A}}_{c}({{\mathit \phi}}$) $-0.01 \pm0.12$
 ${{\mathit A}}_{s}({{\mathit \phi}}$) $-0.07 \pm0.12$
 a$_{P}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ) $-0.037 \pm0.015$
 a$_{P}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{+}}{{\mathit \pi}^{-}}$ ) $0.04 \pm0.05$
 a$_{CP}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ) $0.011 \pm0.015$
 a$_{CP}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{+}}{{\mathit \pi}^{-}}$ ) $-0.01 \pm0.05$
 a$_{P}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) $-0.05 \pm0.05$
 a$_{CP}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ) $0.01 \pm0.05$
${{\boldsymbol \Lambda}_{{b}}^{0}}$ DECAY PARAMETERS
 $\alpha$ decay parameter for ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ $0.18 \pm0.13$
 A${}^{{{\mathit \ell}}}_{FB}$( ${{\mathit \mu}}{{\mathit \mu}}$ ) in ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ $-0.05 \pm0.09$
 A${}^{h}_{FB}$( ${{\mathit p}}{{\mathit \pi}}$ ) in ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}$( ${{\mathit p}}{{\mathit \pi}}$) ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ $-0.29 \pm0.08$
 f$_{L}$( ${{\mathit \mu}}{{\mathit \mu}}$ ) longitudinal polarization fraction in ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ $0.61 {}^{+0.11}_{-0.14}$
FORWARD-BACKWARD ASYMMETRIES
 A$_{FB}$( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \Lambda}}$ ) $0.04 \pm0.07$
 ${{\mathit A}}_{P}({{\mathit \Lambda}_{{b}}^{0}}$) $0.024 \pm0.016$  (S = 1.1)
The branching fractions B( ${{\mathit b}}$ -baryon $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \ell}^{-}}{{\overline{\mathit \nu}}_{{{{\mathit \ell}}}}}$ anything) and B( ${{\mathit \Lambda}_{{b}}^{0}}$ $\rightarrow$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \ell}^{-}}{{\overline{\mathit \nu}}_{{{{\mathit \ell}}}}}$ anything) are not pure measurements because the underlying measured products of these with B( ${{\mathit b}}$ $\rightarrow$ ${{\mathit b}}$ -baryon) were used to determine B( ${{\mathit b}}$ $\rightarrow$ ${{\mathit b}}$ -baryon), as described in the note Production and Decay of ${{\mathit b}}$-Flavored Hadrons.''
For inclusive branching fractions, $\mathit e.g.,$ ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}_{{c}}}$ anything, the values usually are multiplicities, not branching fractions. They can be greater than one.
 constrained fit information