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

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

We have omitted some results that have been superseded by later experiments. See our earlier editions.
 ${{\mathit \Sigma}^{+}}$ MASS $1189.37 \pm0.07$ MeV (S = 2.2)
 ${{\mathit \Sigma}^{+}}$ MEAN LIFE $(8.018 \pm0.026) \times 10^{-11}$ s
 (${\mathit \tau}_{{{\mathit \Sigma}^{+}}}–{\mathit \tau}_{{{\overline{\mathit \Sigma}}^{-}}}$) $/$ ${\mathit \tau}_{{{\mathit \Sigma}^{+}}}$ $-0.0006 \pm0.0012$
 ${{\mathit \Sigma}^{+}}$ MAGNETIC MOMENT $2.458 \pm0.010$ $\mu _{\mathit N}$ (S = 2.1)
 (${\mathit \mu}_{{{\mathit \Sigma}^{+}}}$ $+$ ${\mathit \mu}_{{{\overline{\mathit \Sigma}}^{-}}}$) $/$ ${\mathit \mu}_{{{\mathit \Sigma}^{+}}}$ $0.014 \pm0.015$
${{\boldsymbol \Sigma}^{+}}$ DECAY PARAMETERS
 $\alpha _{0}$ FOR ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{0}}$ $-0.980 {}^{+0.017}_{-0.015}$
 $\phi _{0}$ ANGLE FOR ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{0}}$ ($\phi _{0}$ = $\beta /\gamma$) $36 \pm34$ $^\circ{}$
 $\alpha _{+}$ $/$ $\alpha _{0}$ $-0.069 \pm0.013$
 $\alpha _{+}$ FOR ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \pi}^{+}}$ $0.068 \pm0.013$
 $\phi _{+}$ ANGLE FOR ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \pi}^{+}}$ ($\phi _{+}$ = $\beta /\gamma$) $167 \pm20$ $^\circ{}$ (S = 1.1)
 $\alpha _{\gamma }$ FOR ${{\mathit \Sigma}^{+}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \gamma}}$ $-0.76 \pm0.08$
 constrained fit information