${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{b}}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Sum of 26 exclusive modes  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M052.124
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{88}$ ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{b}}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Sum of 26 exclusive modes $<3.7 \times 10^{-6}$ CL= 90%
Category: Radiative decays
The following data is related to the above value:
$\Gamma({{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{b}}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Sum of 26 exclusive modes$)/\Gamma_{\text{total}}$
$\Gamma_{88}/\Gamma$