${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{+}}{{\mathit e}^{-}}{{\mathit e}^{-}}$ + c.c.  Decay Mode Summary INSPIRE   JSON PDGID:
M070.507
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{418}$ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{+}}{{\mathit e}^{-}}{{\mathit e}^{-}}$ + c.c. $<2.1 \times 10^{-9}$ CL= 90% 1467
Category: Charge conjugation ($\mathit C$), Parity ($\mathit P$), Lepton Family number ($\mathit LF$) violating modes
Note: (L) Violation of total lepton number conservation also implies violation of lepton family number conservation.
The following data is related to the above decay:
$\Gamma({{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{+}}{{\mathit e}^{-}}{{\mathit e}^{-}}$ + c.c.$)/\Gamma_{\text{total}}$
$\Gamma_{418}/\Gamma$