${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}$  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M070.83
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{261}$ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}$ ($1.090$ $\pm0.013$) $ \times 10^{-3}$ 1500
Category: Radiative decays
The following data is related to the above value:
$\Gamma({{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}})/\Gamma_{\text{total}}$
$\Gamma_{261}/\Gamma$