${{\mathit \psi}{(4660)}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \eta}}$ INSPIRE search

$\Gamma($ ${{\mathit \psi}{(4660)}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \eta}})$ ${\times }$ $\Gamma($ ${{\mathit \psi}{(4660)}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}})/\Gamma_{\text{total}}$
$\Gamma_{3}\Gamma_{1}/\Gamma$
M189G01