Searches for lepton number violating $K^{+}\to {\pi }^{-}({\pi }^0)e^{+}{e}^{+}$ decays

NA62 collaboration

Searches for lepton number violating $K^{+}\to {\pi }^{-}{e}^{+}{e}^{+}$ and $K^{+}\to {\pi }^{-}{\pi }^0{e}^{+}{e}^{+}$ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 20…