${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}{(958)}}$  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M049.55
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{91}$ ${{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}{(958)}}$ $<1.9 \times 10^{-6}$ CL= 90% 4682
Category: Radiative decays
The following data is related to the above value:
$\Gamma({{\mathit \Upsilon}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}{(958)}})/\Gamma_{\text{total}}$
$\Gamma_{91}/\Gamma$