${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$  Decay Mode Summary INSPIRE   PDGID:
S014.1
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{2}$ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}}$ ($39.36$ $\pm0.18$) $ \times 10^{-2}$ 274
Category: Neutral modes
The following data is related to the above value:
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$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{2}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ neutral modes$)/\Gamma_{\text{total}}$
$\Gamma_{1}/\Gamma$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})/\Gamma_{\text{total}}$
$\Gamma_{2}/\Gamma$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ neutral modes$)$
$\Gamma_{2}/\Gamma_{1}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}})/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ neutral modes$)$
$\Gamma_{3}/\Gamma_{1}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}})/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{3}/\Gamma_{2}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{0}}$2 ${{\mathit \gamma}})/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{4}/\Gamma_{2}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ invisible$)/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{7}/\Gamma_{2}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ neutral modes$)/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}})$
$\Gamma_{1}/\Gamma_{9}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}})$
$\Gamma_{2}/\Gamma_{9}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}})/[\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$+ $\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 3 ${{\mathit \pi}^{0}})\rbrack{}$
$\Gamma_{9}/(\Gamma_{2}$+ $\Gamma_{3}$)
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ neutral modes$)/[\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}})$+ $\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}})$+ $\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}})\rbrack{}$
$\Gamma_{1}/(\Gamma_{9}$+ $\Gamma_{10}$+ $\Gamma_{11}$)
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})/[\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}})$+ $\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}})$+ $\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}})\rbrack{}$
$\Gamma_{2}/(\Gamma_{9}$+ $\Gamma_{10}$+ $\Gamma_{11}$)
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}})/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{14}/\Gamma_{2}$
$\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 3 ${{\mathit \gamma}})/\Gamma($ ${{\mathit \eta}}$ $\rightarrow$ 2 ${{\mathit \gamma}})$
$\Gamma_{29}/\Gamma_{2}$