Revealing dipion correlations for the observed substructure near the ${\pi }^{+}{\pi }^{-}$ mass threshold in $\psi (3686)\to J/\psi {\pi }^{+}{\pi }^{-}$

Zhong-Yu Wang, Zhe Liu, Xiang Liu

Based on the world's largest $\psi (3686)$ data sample, the BESIII Collaboration recently reported a substructure near the ${\pi }^{+}{\pi }^{-}$ mass threshold in the decay $\psi (3686)\to J/\psi {\pi }^{+}{\pi }^{-}$,…