Search for the lepton number violation decay $\varphi \to {\pi }^{+}{\pi }^{+}{e}^{-}{e}^{-}$ via $J/\psi \to \varphi \eta$

BESIII Collaboration, M. Ablikim, M. N. Achasov +596

Using $(1.0087\pm 0.0044)\times 10^{10}$ $J/\psi$ events collected by the BESIII detector at the BEPCII collider, we search for the lepton number violation decay $\varphi \to {\pi }^{+}{\pi }^{+}{e}^{-}{e}^{-}$…