${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit X}{(2120)}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit X}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$  Decay Mode Summary INSPIRE   JSON  (beta) PDGID:
M070.425
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{372}$ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit X}{(2120)}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit X}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$ ($8.2$ $\pm1.3$) $ \times 10^{-7}$
Category: Dalitz decays
The following data is related to the above value:
$\Gamma({{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit X}{(2120)}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit X}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}})/\Gamma_{\text{total}}$
$\Gamma_{372}/\Gamma$