Measurement of the branching fraction for $\ddot{I}ˆ(3770)\to {\hat{I}}^3\ddot{I}{‡}_{c0}$

Abstract

By analyzing a data set of 2.92 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data taken at $\sqrt{s}=3.773\mathrm{GeV}$ and 106.41$\times 10^6$ $\ddot{I}ˆ(3686)$ decays taken at $\sqrt{s}=3.686\mathrm{GeV}$ with the BESIII detector at the BEPCII collider, we measure the branching fraction and the partial decay width for $\ddot{I}ˆ(3770)\to {\hat{I}}^3\ddot{I}{‡}_{c0}$ to be $\mathcal{B}(\ddot{I}ˆ(3770)\to {\hat{I}}^3\ddot{I}{‡}_{c0})=(6.88\pm 0.28\pm 0.67)\times 10^{-3}$ and $\hat{I}“[\ddot{I}ˆ(3770)\to {\hat{I}}^3\ddot{I}{‡}_{c0}]=(187\pm 8\pm 19)\mathrm{keV}$, respectively. These are the most precise measurements to date.

11 pages, 2 figures