${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Dark Photon INSPIRE search

$\Gamma($ ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}$ Dark Photon$)/\Gamma_{\text{total}}$
$\Gamma_{31}/\Gamma$
M002R72