${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(2S)}}$  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M049.193
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{111}$ ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(2S)}}$ $<4 \times 10^{-4}$ CL= 90% 4031
Category: Radiative decays
The following data is related to the above value:
$\Gamma({{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(2S)}})/\Gamma_{\text{total}}$
$\Gamma_{111}/\Gamma$