${{\boldsymbol \Lambda}}$ 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We have omitted some results that have been superseded by later experiments.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 ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ $0.732 \pm0.014$  (S = 2.3)
 $\alpha _{+}$ FOR ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$ $-0.758 \pm0.012$
 ${{\overline{\mathit \alpha}}_{{0}}}$ FOR ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit n}}}{{\mathit \pi}^{0}}$ $-0.692 \pm0.017$
 $\phi$ ANGLE FOR ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ (tan$\phi$ = $\beta$ $/$ $\gamma$) $-6.5 \pm3.5$ $^\circ{}$
 $\alpha _{0}$ $/$ $\alpha _{−}$ = $\alpha\mathrm {( {{\mathit \Lambda}} \rightarrow {{\mathit n}} {{\mathit \pi}^{0}} )}$ $/$ $\alpha\mathrm {( {{\mathit \Lambda}} \rightarrow {{\mathit p}} {{\mathit \pi}^{-}} )}$ $1.01 \pm0.07$
 ${{\overline{\mathit \alpha}}_{{0}}}$ $/$ ${{\mathit \alpha}_{{+}}}$ in ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit n}}}{{\mathit \pi}^{0}}$ , ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$ $0.913 \pm0.030$
 ($\alpha$ + $\bar\alpha)/(\alpha −\bar\alpha$) in ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ , ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$ $-0.002 \pm0.012$
 R = $\vert G_{E}/G_{M}\vert$ in ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ , ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$ $0.96 \pm0.14$
 $\Delta \Phi$ = $\Phi _{E}$ $−$ $\Phi _{M}$ in ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{-}}$ , ${{\overline{\mathit \Lambda}}}$ $\rightarrow$ ${{\overline{\mathit p}}}{{\mathit \pi}^{+}}$ $37 \pm13$ degrees
 ${\mathit g}_{{{\mathit A}}}$ $/$ ${\mathit g}_{{{\mathit V}}}$ FOR ${{\mathit \Lambda}}$ $\rightarrow$ ${{\mathit p}}{{\mathit e}^{-}}{{\overline{\mathit \nu}}_{{e}}}$ $-0.718 \pm0.015$
 constrained fit information