${{\mathit \psi}{(3770)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$  Decay Mode Summary INSPIRE   PDGID:
M053.231
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{103}$ ${{\mathit \psi}{(3770)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}}$ $<7 \times 10^{-4}$ CL= 90% 707
Category: Radiative decays
The following data is related to the above value:
$\Gamma($ ${{\mathit \psi}{(3770)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{{c}}}})/\Gamma_{\text{total}}$
$\Gamma_{103}/\Gamma$