${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$  Decay Mode Summary INSPIRE   PDGID:
M070.2
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level
P(MeV/c)  
$\Gamma_{7}$ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ($5.961$ $\pm0.033$) $ \times 10^{-2}$ 1545
The following data is related to the above value:
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