${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$   Decay Mode Summary INSPIRE   PDGID:
M059.13
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{19}$ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$ ($2.6$ $\pm1.9$) $ \times 10^{-3}$ 1680
The following data is related to the above value:
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$\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$ $)/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{c}}{(2S)}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{19}/\Gamma{\times }\Gamma^{{{\mathit \psi}{(2S)}}}_{170}/\Gamma^{{{\mathit \psi}{(2S)}}}$
$\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{16}\Gamma_{19}/\Gamma$