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

Zhong-Yu Wang, Zhe Liu, Xiang Liu

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