${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$   Decay Mode Summary INSPIRE   PDGID:
M026.31
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{56}$ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ ($1.68$ $\pm0.12$) $ \times 10^{-4}$ 1492
Category: Radiative decays
The following data is related to the above value:
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$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)$
$\Gamma_{56}$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}{(958)}}{{\mathit \pi}}{{\mathit \pi}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{1}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \rho}}{{\mathit \rho}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{3}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{*}{(892)}}{{\overline{\mathit K}}^{*}{(892)}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{5}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \phi}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{8}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \omega}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{15}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \phi}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{16}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit f}_{{2}}{(1270)}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{17}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit f}_{{2}}^{\,'}{(1525)}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{18}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{34}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{38}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{39}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ 2( ${{\mathit K}^{+}}{{\mathit K}^{-}}))$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{42}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}))$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{45}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{48}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ $)$ ${\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{60}\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $)$
$\Gamma_{56}/\Gamma_{34}$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}}$ $)/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{48}/\Gamma{\times }\Gamma_{56}/\Gamma$
$\Gamma($ ${{\mathit \eta}_{{c}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $)/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit \eta}_{{c}}}{{\mathit K}^{+}}$ $)/\Gamma_{\text{total}}$
$\Gamma_{56}/\Gamma{\times }\Gamma^{{{\mathit B}^{\pm}}}_{241}/\Gamma^{{{\mathit B}^{\pm}}}$