${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \nu}_{{{\tau}}}}{{\overline{\mathit \nu}}_{{{\tau}}}}$  Decay Mode Summary INSPIRE   PDGID:
S009.13
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{10}$ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \nu}_{{{\tau}}}}{{\overline{\mathit \nu}}_{{{\tau}}}}$ $<2.1 \times 10^{-6}$ CL= 90% 67
The following data is related to the above value:
$\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \nu}_{{{\tau}}}}{{\overline{\mathit \nu}}_{{{\tau}}}})/\Gamma_{\text{total}}$
$\Gamma_{10}/\Gamma$