${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{{c}}}}$  Decay Mode Summary INSPIRE   PDGID:
M049.146
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{8}$ ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{{c}}}}$ $<2.2 \times 10^{-6}$ CL= 90% 3623
Category: Hadronic decays
The following data is related to the above value:
$\Gamma($ ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit J / \psi}{(1S)}}{{\mathit \eta}_{{{c}}}})/\Gamma_{\text{total}}$
$\Gamma_{8}/\Gamma$