${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)  Decay Mode Summary INSPIRE   PDGID:
M026.11
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{45}$ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$) ($8.7$ $\pm1.1$) $ \times 10^{-3}$ 1459
Category: Decays into stable hadrons
The following data is related to the above value:
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$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}))/\Gamma_{\text{total}}$
$\Gamma_{45}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}))$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{45}\Gamma_{56}/\Gamma$