${{\boldsymbol \Sigma}^{-}}$ $\rightarrow$ ${{\boldsymbol n}}{{\boldsymbol \pi}^{-}}{{\boldsymbol \gamma}}$ INSPIRE search

$\Gamma($ ${{\mathit \Sigma}^{-}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \pi}^{-}}{{\mathit \gamma}}$ $)/\Gamma($ ${{\mathit \Sigma}^{-}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \pi}^{-}}$ $)$
$\Gamma_{2}/\Gamma_{1}$
S020R4