${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{-}}{{\mathit \gamma}}$  Decay Mode Summary INSPIRE   PDGID:
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level
$\Gamma_{188}$ ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \mu}^{-}}{{\mathit \gamma}}$ $<4.2 \times 10^{-8}$ CL= 90% 885
Category: Lepton Family number ($\mathit LF$), Lepton number ($\mathit L$), or Baryon number ($\mathit B$) violating modes (In the modes below, ${{\mathit \ell}}$ means a sum over ${{\mathit e}}$ and ${{\mathit \mu}}$ modes)
Note: (LF) Lepton family number conservation means separate conservation of each of $\mathit L_{{{\mathit e}}}$, $\mathit L_{{{\mathit \mu}}}$, $\mathit L_{{{\mathit \tau}}}$.
The following data is related to the above value: