${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit f}_{{{1}}}{(1420)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{*}{(892)}^{0}}{{\mathit K}_S^0}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$  Decay Mode Summary INSPIRE   JSON PDGID:
M070.510
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{306}$ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit f}_{{{1}}}{(1420)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{*}{(892)}^{0}}{{\mathit K}_S^0}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}}$ ($7.2$ ${}^{+0.7}_{-1.3}$) $ \times 10^{-5}$
Category: Radiative decays
The following data is related to the above decay:
$\Gamma({{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit f}_{{{1}}}{(1420)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{*}{(892)}^{0}}{{\mathit K}_S^0}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \pi}^{0}})/\Gamma_{\text{total}}$
$\Gamma_{306}/\Gamma$