${{\mathit K}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}_{{{e}}}}$  Decay Mode Summary INSPIRE   PDGID:
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level
$\Gamma_{43}$ ${{\mathit K}^{+}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \nu}_{{{e}}}}$ $<4 \times 10^{-3}$ CL= 90% 236
Category: Lepton family number ($\mathit LF$), Lepton number ($\mathit L$), $\Delta \mathit S$ = $\Delta \mathit Q$ ($\mathit SQ$) violating modes, or $\Delta \mathit S$ = 1 weak neutral current ($\mathit S1$) modes
Note: (LF) Lepton family number conservation means separate conservation of each of $\mathit L_{{{\mathit e}}}$, $\mathit L_{{{\mathit \mu}}}$, $\mathit L_{{{\mathit \tau}}}$.
Note: Derived from an analysis of neutrino-oscillation experiments.
The following data is related to the above value: