${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}_{{{D}}}}$  Decay Mode Summary INSPIRE   JSON PDGID:
S032.603
Mode (*) Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{415}$ ${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}_{{{D}}}}$ $<2.0 \times 10^{-6}$ CL= 90%
Category: Exotic modes
Note: Here ${{\mathit \gamma}_{{{D}}}}$ stands for massless dark photon.
The following data is related to the above decay:
$\Gamma({{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}_{{{D}}}})/\Gamma_{\text{total}}$
$\Gamma_{415}/\Gamma$