Observation of the electromagnetic doubly OZI-suppressed decay $J/\psi \to \varphi {\pi }^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +411

Using a sample of $1.31$ billion $J/\psi$ events accumulated with the BESIII detector at the BEPCII collider, we report the observation of the decay $J/\psi \to \varphi {\pi }^0$, which is…