${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}}$  Decay Mode Summary INSPIRE   PDGID:
M070.85
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{237}$ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}}$ ($1.41$ $\pm0.14$) $ \times 10^{-2}$ S=1.3  111
Category: Radiative decays
The following data is related to the above value:
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$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \rho}}{{\mathit \rho}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{4}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{*}{(892)}^{0}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$ + c.c.$)/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{5}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{*}{(892)}}{{\overline{\mathit K}}^{*}{(892)}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{6}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{*}{(892)}^{0}}{{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{7}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \phi}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{9}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \omega}}{{\mathit \omega}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{16}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit f}_{{{2}}}{(1270)}}{{\mathit f}_{{{2}}}{(1270)}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{18}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{37}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{39}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{41}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}))/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{44}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}))/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{48}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ 3( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}))/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{50}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit p}}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{51}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\overline{\mathit \Lambda}}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{54}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{57}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \Xi}^{-}}{{\overline{\mathit \Xi}}^{+}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{58}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{59}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma$
$\Gamma($ ${{\mathit J / \psi}{(1S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}{(1S)}})/\Gamma_{\text{total}}{\times }$ $\Gamma($ ${{\mathit \eta}_{{{c}}}{(1S)}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}{(958)}}{{\mathit \pi}}{{\mathit \pi}})/\Gamma_{\text{total}}$
$\Gamma_{237}/\Gamma{\times }\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}_{1}/\Gamma^{{{\mathit \eta}_{{{c}}}{(1S)}}}$