${{\boldsymbol \Lambda}}$ BARYONS
($\boldsymbol S$ = $-1$, $\boldsymbol I$ = 0)
${{\mathit \Lambda}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$
INSPIRE search

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

We have omitted some results that have been superseded by later experiments. See our earlier editions.
See related review:
Baryon Magnetic Moments
${{\mathit \Lambda}}$ MASS   $1115.683 \pm0.006$ MeV 
(${\mathit m}_{{{\mathit \Lambda}}}–{\mathit m}_{{{\overline{\mathit \Lambda}}}}$) $/$ ${\mathit m}_{{{\mathit \Lambda}}}$   $(-0.1 \pm1.1) \times 10^{-5}$  (S = 1.6)
${{\boldsymbol \Lambda}}$ MEAN LIFE
Mean life $\tau $   $(2.632 \pm0.020) \times 10^{-10}$ s (S = 1.6)
(${\mathit \tau}_{{{\mathit \Lambda}}}–{\mathit \tau}_{{{\overline{\mathit \Lambda}}}}$) $/$ ${\mathit \tau}_{{{\mathit \Lambda}}}$   $-0.001 \pm0.009$  
${{\mathit \Lambda}}$ MAGNETIC MOMENT   $-0.613 \pm0.004$ $\mu _{\mathit N}$ 
${{\mathit \Lambda}}$ ELECTRIC DIPOLE MOMENT   $<1.5 \times 10^{-16}$ $\mathit e~$cm  CL=95.0%
${{\boldsymbol \Lambda}}$ DECAY PARAMETERS
$\alpha _{−}$ FOR ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$   $0.642 \pm0.013$  
$\alpha _{+}$ FOR ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$   $-0.71 \pm0.08$  
$\phi $ ANGLE FOR ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ (tan$\phi $ = $\beta $ $/$ $\gamma $)   $-6.5 \pm3.5$ $^\circ{}$ 
$\alpha _{0}$ $/$ $\alpha _{−}$ = $\alpha\mathrm {( {{\mathit \Lambda}} \rightarrow {{\mathit n}} {{\mathit \pi}^{0}} )}$ $/$ $\alpha\mathrm {( {{\mathit \Lambda}} \rightarrow {{\mathit p}} {{\mathit \pi}^{-}} )}$   $1.01 \pm0.07$  
($\alpha $ + $\bar\alpha)/(\alpha −\bar\alpha$) in ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ , ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$   $0.006 \pm0.021$  
${\mathit g}_{{{\mathit A}}}$ $/$ ${\mathit g}_{{{\mathit V}}}$ FOR ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$   $-0.718 \pm0.015$  
$\Gamma_{1}$ ${{\mathit p}}{{\mathit \pi}^{-}}$ $(63.9\pm{0.5})\%$101
$\Gamma_{2}$ ${{\mathit n}}{{\mathit \pi}^{0}}$ $(35.8\pm{0.5})\%$104
$\Gamma_{3}$ ${{\mathit n}}{{\mathit \gamma}}$ $(1.75\pm{0.15})\times 10^{-3}$162
$\Gamma_{4}$ ${{\mathit p}}{{\mathit \pi}^{-}}{{\mathit \gamma}}$ [1]$(8.4\pm{1.4})\times 10^{-4}$101
$\Gamma_{5}$ ${{\mathit p}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$ $(8.32\pm{0.14})\times 10^{-4}$163
$\Gamma_{6}$ ${{\mathit p}}{{\mathit \mu}^{-}}{{\overline{\mathit \nu}}_{{\mu}}}$ $(1.57\pm{0.35})\times 10^{-4}$131
    constrained fit information