${{\mathit \chi}_{{{c1}}}{(1P)}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit J / \psi}{(1S)}}$  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M055.103
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{108}$ ${{\mathit \chi}_{{{c1}}}{(1P)}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit J / \psi}{(1S)}}$ ($2.33$ $\pm0.29$) $ \times 10^{-4}$ 335
Category: Radiative decays
The following data is related to the above value:
$\Gamma({{\mathit \chi}_{{{c1}}}{(1P)}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit J / \psi}{(1S)}})/\Gamma({{\mathit \chi}_{{{c1}}}{(1P)}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit J / \psi}{(1S)}})$
$\Gamma_{108}/\Gamma_{107}$