Study of $\ddot{I}ˆ(3686)\to \hat{I}›\bar{\hat{I}}›\ddot{I}‰$

Abstract

Based on a data sample of $(448.1\pm 2.9)\times 10^6$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector at the BEPCII collider, the branching fraction of $\ddot{I}ˆ(3686)\to \hat{I}›\bar{\hat{I}}›\ddot{I}‰$ is measured to be $(3.30\pm 0.34(stat.)\pm 0.29(syst.))\times 10^{-5}$ for the first time. In addition, the $\hat{I}›\ddot{I}‰$ (or $\bar{\hat{I}}›\ddot{I}‰$) invariant mass spectra is studied and the potential presence of excited $\hat{I}›$ states has been investigated.