Searches for isospin-violating transitions $\ddot{I}{‡}_{c0,2}\to \ddot{I}{€}^0\hat{I}{\cdot }_c$

Abstract

We present the first upper-limit measurement of the branching fractions of the isospin-violating transitions $\ddot{I}{‡}_{c0,2}\to \ddot{I}{€}^0\hat{I}{\cdot }_c$. The measurements are performed using $106\times 10^6$ $\ddot{I}ˆ(3686)$ events accumulated with the BESIII detector at the BEPCII $e^{+}{e}^{-}$ collider at a center-of-mass energy corresponding to the $\ddot{I}ˆ(3686)$ mass. We obtained upper limits on the branching fractions at a 90\% confidence level of $B(\ddot{I}{‡}_{c0}\to \ddot{I}{€}^0\hat{I}{\cdot }_c)<1.6\times 10^{-3}$ and $B(\ddot{I}{‡}_{c2}\to \ddot{I}{€}^0\hat{I}{\cdot }_c)<3.2\times 10^{-3}$.

9 pages, 3 figures