${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}$  Decay Mode Summary INSPIRE   PDGID:
M049.54
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{92}$ ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}$ $<1.0 \times 10^{-6}$ CL= 90% 4714
Category: Radiative decays
The following data is related to the above value:
$\Gamma($ ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}})/\Gamma_{\text{total}}$
$\Gamma_{92}/\Gamma$