${{\mathit \eta}_{{{c}}}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$  Decay Mode Summary INSPIRE   PDGID:
M059.2
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level
P(MeV/c)  
$\Gamma_{16}$ ${{\mathit \eta}_{{{c}}}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ ($1.8$ $\pm1.2$) $ \times 10^{-4}$ 1819
The following data is related to the above value:
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