${{\mathit \pi}^{0}}$ $\rightarrow$ invisible  Decay Mode Summary INSPIRE   PDGID:
S009.23
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{7}$ ${{\mathit \pi}^{0}}$ $\rightarrow$ invisible $<4.4 \times 10^{-9}$ CL= 90%
The following data is related to the above value:
$\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ invisible$)/\Gamma_{\text{total}}$
$\Gamma_{7}/\Gamma$