${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{c}}}$   Decay Mode Summary INSPIRE   PDGID:
M052.143
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{9}$ ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{c}}}$ $<5.4 \times 10^{-6}$ CL= 90% 3984
The following data is related to the above value:
$\Gamma($ ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{c}}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{9}/\Gamma$