Observation of Radiative Decay $D^0\to \varphi \gamma$

The Belle Collaboration, O. Tajima

We report the observation of the decay $D^0\to \varphi \gamma$ with a statistical significance of $5.4\sigma$ in $78.1 \ifb$ of data collected by the Belle experiment at the KEKB $e^{+}{e}^{-}$ colli…