${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \eta}^{\,'}}$   Decay Mode Summary INSPIRE   PDGID:
M047.26
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{20}$ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \eta}^{\,'}}$ ($3.4$ $\pm0.9$) $ \times 10^{-5}$
The following data is related to the above value:
$\Gamma($ ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \Upsilon}{(1S)}}{{\mathit \eta}^{\,'}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{20}/\Gamma$