pdgLive Home   >   BOTTOM BARYONS ($\mathit B$ = $-1$)   >   ${{\mathit \Xi}_{{{b}}}^{-}}$

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.

Expand/Collapse All

▸  exp ${{\mathit \Xi}_{{{b}}}^{-}}$ 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

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

${{\mathit \Xi}_{{{b}}}^{-}}$ MEAN LIFE ($1.570$ $\pm0.023$) $ \times 10^{-12}$ s

▸  exp 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 $1.08$ $\pm0.04$

▸  exp $\mathit P$ VIOLATION ASYMMETRY

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

▸  exp 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(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}}$) ($1.0$ $\pm0.4$) $ \times 10^{-5}$ 1786   $\Gamma_{2}$ ${{\mathit J / \psi}}{{\mathit \Lambda}}{{\mathit K}^{-}}$ ${\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}}$) ($2.3$ $\pm0.7$) $ \times 10^{-6}$ 1636   $\Gamma_{3}$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}$ ${\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}}$) ($3.7$ $\pm0.8$) $ \times 10^{-8}$ 2734   $\Gamma_{4}$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit K}^{-}}$ ($2.3$ $\pm0.9$) $ \times 10^{-6}$ 2734   $\Gamma_{5}$ ${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ $<1.3$ $\times 10^{-6}$ CL=90% 2815   $\Gamma_{6}$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \pi}^{-}}$ ($2.3$ $\pm1.1$) $ \times 10^{-6}$ 2786   $\Gamma_{7}$ ${{\mathit \Lambda}_{{{b}}}^{0}}{{\mathit \pi}^{-}}$ ${\times }$ B(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Xi}_{{{b}}}^{-}})/B({{\mathit b}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{b}}}^{0}}$ ) ($7.0$ $\pm0.9$) $ \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(${{\mathit b}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{b}}}^{0}}$ ) ($1.9$ $\pm0.5$) $ \times 10^{-3}$ 1857   $\Gamma_{10}$ ${{\mathit \Sigma}{(1385)}}{{\mathit K}^{-}}$ ($2.6$ $\pm2.3$) $ \times 10^{-7}$ 2710   $\Gamma_{11}$ ${{\mathit \Lambda}{(1405)}}{{\mathit K}^{-}}$ ($1.9$ $\pm1.2$) $ \times 10^{-7}$ 2705   $\Gamma_{12}$ ${{\mathit \Lambda}{(1520)}}{{\mathit K}^{-}}$ ($7.6$ $\pm3.2$) $ \times 10^{-7}$ 2675   $\Gamma_{13}$ ${{\mathit \Lambda}{(1670)}}{{\mathit K}^{-}}$ ($4.5$ $\pm2.3$) $ \times 10^{-7}$ 2632   $\Gamma_{14}$ ${{\mathit \Sigma}{(1775)}}{{\mathit K}^{-}}$ ($2.2$ $\pm1.5$) $ \times 10^{-7}$ 2601   $\Gamma_{15}$ ${{\mathit \Sigma}{(1915)}}{{\mathit K}^{-}}$ ($2.6$ $\pm2.5$) $ \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