$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit f}_{{2}}{(1270)}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{17}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit f}_{{2}}{(1270)}}$ $)$ ${\times }\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{17}\Gamma_{56}/\Gamma$