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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: S069

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

In the quark model, ${{\mathit \Xi}_{{{b}}}^{0}}$ and ${{\mathit \Xi}_{{{b}}}^{-}}$ are an isodoublet ($\mathit usb$, $\mathit dsb$) state; the lowest ${{\mathit \Xi}_{{{b}}}^{0}}$ and ${{\mathit \Xi}_{{{b}}}^{-}}$ ought to have $\mathit J{}^{P} = 1/2{}^{+}$. None of $\mathit I$, $\mathit J$, or ${}^{P}$ have actually been measured.

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

${{\mathit \Xi}_{{{b}}}^{-}}$ MASS   $5797.0 \pm0.4$ MeV (S = 1.4)

${\mathit m}_{{{\mathit \Xi}_{{{b}}}^{-}}}–{\mathit m}_{{{\mathit \Lambda}_{{{b}}}^{0}}}$   $177.48 \pm0.24$ MeV (S = 1.1)

${\mathit m}_{{{\mathit \Xi}_{{{b}}}^{-}}}–{\mathit m}_{{{\mathit \Xi}_{{{b}}}^{0}}}$   $5.9 \pm0.5$ MeV

${{\mathit \Xi}_{{{b}}}^{-}}$ MEAN LIFE

${{\mathit \Xi}_{{{b}}}^{-}}$ MEAN LIFE   $(1.578 \pm0.021) \times 10^{-12}$ s

MEAN LIFE RATIOS

${\mathit \tau}_{{{\mathit \Xi}_{{{b}}}^{-}}}$ $/$ ${\mathit \tau}_{{{\mathit \Lambda}_{{{b}}}^{0}}}$ mean life ratio   $1.078 \pm0.014$

${\mathit \tau}_{{{\mathit \Xi}_{{{b}}}^{-}}}$ $/$ ${\mathit \tau}_{{{\mathit \Xi}_{{{b}}}^{0}}}$ mean life ratio   $1.08 \pm0.04$

$\mathit P$ VIOLATION ASYMMETRY

$\mathit A_{P}({{\mathit \Xi}_{{{b}}}}$), ${{\mathit \Xi}_{{{b}}}^{-}}$ $−$ ${{\mathit \Xi}_{{{b}}}^{+}}$ production asymmetry   $-0.02 \pm0.04$

CP VIOLATION in ${{\mathit \Xi}_{{{b}}}}$ deays

$\mathit A_{CP}({{\mathit \Xi}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit K}^{-}}$)   $-0.3 \pm0.8$

$\mathit A_{CP}({{\mathit \Xi}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}{(1405)}}{{\mathit K}^{-}}$)   $0.0 \pm0.4$

$\mathit A_{CP}({{\mathit \Xi}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}{(1520)}}{{\mathit K}^{-}}$)   $-0.05 \pm0.12$

$\mathit A_{CP}({{\mathit \Xi}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Lambda}{(1670)}}{{\mathit K}^{-}}$)   $0.03 \pm0.17$

$\mathit A_{CP}({{\mathit \Xi}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Sigma}{(1775)}}{{\mathit K}^{-}}$)   $-0.47 \pm0.30$

$\mathit A_{CP}({{\mathit \Xi}_{{{b}}}^{-}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}{{\mathit K}^{-}}$)   $0.11 \pm0.34$

${{\mathit \Xi}_{{{b}}}^{-}}$ DECAY MODES
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit J / \psi}}{{\mathit \Xi}^{-}}$ ${\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}}$)   $(1.0\pm{0.4})\times 10^{-5}$ 1786   $\Gamma_{2}$ ${{\mathit J / \psi}}{{\mathit \Lambda}}{{\mathit K}^{-}}$ ${\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}}$)   $(2.3\pm{0.7})\times 10^{-6}$ 1636   $\Gamma_{3}$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}$ ${\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}}$)   $(3.7\pm{0.8})\times 10^{-8}$ 2734   $\Gamma_{4}$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}$   $(2.3\pm{0.9})\times 10^{-6}$ 2734   $\Gamma_{5}$ ${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$   $<1.3\times 10^{-6}$ CL=90% 2815   $\Gamma_{6}$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}$   $(2.3\pm{1.1})\times 10^{-6}$ 2786   $\Gamma_{7}$ ${{\mathit \Lambda}_{{{b}}}^{0}}{{\mathit \pi}^{-}}$ ${\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}})/B({{\mathit b}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{b}}}^{0}}$ )   $(7.0\pm{0.9})\times 10^{-4}$ 108   $\Gamma_{8}$ ${{\mathit \Xi}_{{{c}}}^{0}}{{\mathit \pi}^{-}}$   seen 2370   $\Gamma_{9}$ ${{\mathit \Xi}_{{{c}}}^{0}}{{\mathit D}_{{{s}}}^{-}}{\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}}$ )/B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{b}}}^{0}}$ )   $(1.9\pm{0.5})\times 10^{-3}$ 1857   $\Gamma_{10}$ ${{\mathit \Sigma}{(1385)}}{{\mathit K}^{-}}$   $(2.6\pm{2.3})\times 10^{-7}$ 2710   $\Gamma_{11}$ ${{\mathit \Lambda}{(1405)}}{{\mathit K}^{-}}$   $(1.9\pm{1.2})\times 10^{-7}$ 2705   $\Gamma_{12}$ ${{\mathit \Lambda}{(1520)}}{{\mathit K}^{-}}$   $(7.6\pm{3.2})\times 10^{-7}$ 2675   $\Gamma_{13}$ ${{\mathit \Lambda}{(1670)}}{{\mathit K}^{-}}$   $(4.5\pm{2.3})\times 10^{-7}$ 2632   $\Gamma_{14}$ ${{\mathit \Sigma}{(1775)}}{{\mathit K}^{-}}$   $(2.2\pm{1.5})\times 10^{-7}$ 2601   $\Gamma_{15}$ ${{\mathit \Sigma}{(1915)}}{{\mathit K}^{-}}$   $(2.6\pm{2.5})\times 10^{-7}$ 2556   $\Gamma_{16}$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}$   2400   $\Gamma_{17}$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit K}^{-}}{{\mathit K}^{-}}$   2331   $\Gamma_{18}$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$   2438   $\Gamma_{19}$ ${{\mathit J / \psi}}{{\mathit \Xi}^{-}}$   seen 1786   $\Gamma_{20}$ ${{\mathit \psi}{(2S)}}{{\mathit \Xi}^{-}}$   seen 1333   $\Gamma_{21}$ ${{\mathit \Xi}^{-}}{{\mathit \gamma}}$   $<1.3\times 10^{-4}$ CL=95% 2748
FOOTNOTES