${{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$  Decay Mode Summary INSPIRE   PDGID:
S009.1
Mode Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{1}$ ${{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$ ($98.823$ $\pm0.034$) $ \times 10^{-2}$ S=1.5  67
The following data is related to the above value:
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$\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}$ positronium$)/\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{3}/\Gamma_{1}$
$\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit e}^{-}})/\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{4}/\Gamma_{1}$
$\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}})/\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{5}/\Gamma_{1}$
3.0$\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}})/\Gamma_{\text{total}}$
3.0$\Gamma_{1}/\Gamma{\times }\Gamma_{2}/\Gamma$
$\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}})/\Gamma($ ${{\mathit \pi}^{0}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{2}/\Gamma_{1}$