${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Dark Photon  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M002.217
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{31}$ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Dark Photon $5.0 \times 10^{-7}\text{ to }3.50 \times 10^{-6} $ CL= 90%
The following data is related to the above value:
$\Gamma({{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Dark Photon$)/\Gamma_{\text{total}}$
$\Gamma_{31}/\Gamma$