Observation of the decay $\psi (3686)\to {\Sigma }^{-}{\bar{\Sigma }}^{+}$ and measurement of its angular distribution

BESIII Collaboration, M. Ablikim, M. N. Achasov +567

Using $(448.1\pm 2.9)\times 10^6$ $\psi (3686)$ events collected with the BESIII detector at the BEPCII collider, the decay $\psi (3686)\to {\Sigma }^{-}{\bar{\Sigma }}^{+}$ is observed for the first time with a…