${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{{c}}}{(2S)}}$ INSPIRE search

$\Gamma($ ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{{c}}}{(2S)}})/\Gamma_{\text{total}}$
$\Gamma_{13}/\Gamma$
M052R57