First measurements of ${\chi }_{cJ}\to {\Sigma }^{-}{\overline{\Sigma }}^{+}\left(J=0,1,2\right)$ decays

We measured the branching fractions of the decays ${\chi }_{cJ}\to {\Sigma }^{-}{\overline{\Sigma }}^{+}$ for the first time using the final states $n\overline{n}{\pi }^{+}{\pi }^{-}$. The data sample exploited here is $448.1×{10}^{6}\text{}\text{}\psi \left(3686\right)$ events collected with BESIII. We find $B\left({\chi }_{cJ}\to {\Sigma }^{-}{\overline{\Sigma }}^{+}\right)=\left(51.3±2.4±4.1\right)×{10}^{-5},\left(5.7±1.4±0.6\right)×{10}^{-5}$, and $\left(4.4±1.7±0.5\right)×{10}^{-5}$, for $J=0$, 1, 2, respectively, where the first uncertainties are statistical and the second systematic.