${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}_{{c}}{(1S)}}$   Decay Mode Summary INSPIRE   PDGID:
M059.15
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{20}$ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}_{{c}}{(1S)}}$ $<0.25$ CL= 90% 538
The following data is related to the above value:
 ▸ expand all datablocks
$\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}_{{c}}{(1S)}}$ $)/\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $)$
$\Gamma_{20}/\Gamma_{2}$
$\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}_{{c}}{(1S)}}$ $)/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{c}}{(2S)}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{20}/\Gamma{\times }\Gamma^{{{\mathit \psi}{(2S)}}}_{170}/\Gamma^{{{\mathit \psi}{(2S)}}}$
$\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}_{{c}}{(1S)}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{20}\Gamma_{16}/\Gamma$