CHARMED BARYONS
($\boldsymbol C$ = $+1$)
${{\mathit \Lambda}_{{c}}^{+}}$ = ${{\mathit u}}{{\mathit d}}{{\mathit c}}$ , ${{\mathit \Sigma}_{{c}}^{++}}$ = ${{\mathit u}}{{\mathit u}}{{\mathit c}}$ , ${{\mathit \Sigma}_{{c}}^{+}}$ = ${{\mathit u}}{{\mathit d}}{{\mathit c}}$ , ${{\mathit \Sigma}_{{c}}^{0}}$ = ${{\mathit d}}{{\mathit d}}{{\mathit c}}$ ,
${{\mathit \Xi}_{{c}}^{+}}$ = ${{\mathit u}}{{\mathit s}}{{\mathit c}}$ , ${{\mathit \Xi}_{{c}}^{0}}$ = ${{\mathit d}}{{\mathit s}}{{\mathit c}}$ , ${{\mathit \Omega}_{{c}}^{0}}$ = ${{\mathit s}}{{\mathit s}}{{\mathit c}}$
INSPIRE search

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

The parity of the ${{\mathit \Lambda}_{{c}}^{+}}$ is defined to be positive (as are the parities of the proton, neutron, and ${{\mathit \Lambda}}$). The quark content is ${{\mathit u}}{{\mathit d}}{{\mathit c}}$ . Results of an analysis of ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$ decays (JEZABEK 1992 ) are consistent with $\mathit J = 1/2$. Nobody doubts that the spin is indeed 1/2. We have omitted some results that have been superseded by later experiments. The omitted results may be found in earlier editions.
${{\mathit \Lambda}_{{c}}^{+}}$ MASS   $2286.46 \pm0.14$ MeV 
${{\mathit \Lambda}_{{c}}^{+}}$ MEAN LIFE   $(2.00 \pm0.06) \times 10^{-13}$ s (S = 1.6)
${{\boldsymbol \Lambda}_{{c}}^{+}}$ DECAY PARAMETERS
$\alpha $ FOR ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$   $-0.91 \pm0.15$  
$\alpha $ FOR ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit \pi}^{0}}$   $-0.45 \pm0.32$  
$\alpha $ FOR ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{\mathit \ell}}}}}$   $-0.86 \pm0.04$  
${{\boldsymbol \Lambda}_{{c}}^{+}}$, ${{\overline{\boldsymbol \Lambda}}_{{c}}^{-}}$ $\boldsymbol CP$-VIOLATING DECAY ASYMMETRIES
($\alpha $ + $\bar\alpha)/(\alpha −\bar\alpha$) in ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$ , ${{\overline{\mathit \Lambda}}_{{c}}^{-}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{-}}$   $-0.07 \pm0.31$  
($\alpha $ + $\bar\alpha)/(\alpha −\bar\alpha$) in ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit e}^{+}}{{\mathit \nu}_{{e}}}$ , ${{\overline{\mathit \Lambda}}_{{c}}^{-}}$ $\rightarrow$ ${{\overline{\mathit \Lambda}}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$   $0.00 \pm0.04$  
Branching fractions marked with a footnote, e.g. [$\mathit a$], have been corrected for decay modes not observed in the experiments. For example, the submode fraction ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit K}}^{*}{(892)}^{0}}$ seen in ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$ has been multiplied up to include ${{\overline{\mathit K}}^{*}{(892)}^{0}}$ $\rightarrow$ ${{\overline{\mathit K}}^{0}}{{\mathit \pi}^{0}}$ decays.
    constrained fit information