Improved measurements of ${\chi }_{cJ}\to {\Sigma }^{+}{\overline{\Sigma }}^{-}$ and ${\Sigma }^{0}{\overline{\Sigma }}^{0}$ decays

Using a data sample of $\left(448.1±2.9\right)×{10}^{6}\text{}\psi \left(3686\right)$ events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays ${\chi }_{cJ}\to {\Sigma }^{+}{\overline{\Sigma }}^{-}$ and ${\Sigma }^{0}{\overline{\Sigma }}^{0}$. The decays ${\chi }_{c1,2}\to {\Sigma }^{+}{\overline{\Sigma }}^{-}$ and ${\Sigma }^{0}{\overline{\Sigma }}^{0}$ are observed for the first time, and the branching fractions for ${\chi }_{c0}\to {\Sigma }^{+}{\overline{\Sigma }}^{-}$ and ${\Sigma }^{0}{\overline{\Sigma }}^{0}$ decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry.