Measurement of the $CP$-even fraction of $D^0\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +571

A determination of the $CP$-even fraction $F_{+}$ in the decay $D^0\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ is presented. Using $2.93$ fb${}^{-1}$ of $e^{+}{e}^{-}\to \psi (3770)\to D\bar{D}$ data collected by the B…