Search for C-parity violation in $J/\psi \to \gamma \gamma$ and $\gamma \varphi$

BESIII Collaboration, M. Ablikim, M. N. Achasov +391

Using $1.06\times 10^8$ $\psi (3686)$ events recorded in $e^{+}{e}^{-}$ collisions at $\sqrt{s}=$ 3.686 GeV with the BESIII at the BEPCII collider, we present searches for C-parity violat…