${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}{(958)}}$  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M070.84
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{270}$ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}{(958)}}$ ($5.28$ $\pm0.06$) $ \times 10^{-3}$ S=1.3  1400
Category: Radiative decays
The following data is related to the above value:
$\Gamma({{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}{(958)}})/\Gamma_{\text{total}}$
$\Gamma_{270}/\Gamma$