Measurement of the absolute branching fractions of $\hat{I}{›}_c^{+}\to \hat{I}›\hat{I}\cdot \ddot{I}{€}^{+}$ and $\hat{I}\pounds (1385{)}^{+}\hat{I}\cdot$

Abstract

We study the decays $\hat{I}{›}_c^{+}\to \hat{I}›\hat{I}\cdot \ddot{I}{€}^{+}$ and $\hat{I}\pounds (1385{)}^{+}\hat{I}\cdot$ based on $\hat{I}{›}_c^{+}\bar{\hat{I}}{›}_c^{-}$ pairs produced in $e^{+}{e}^{-}$ collisions at a center-of-mass energy of $\sqrt{s}=4.6~\mbox{GeV}$, corresponding to an integrated luminosity of $567\;\mbox{pb$^{-1}$}$. The data sample was accumulated with the BESIII detector at the BEPCII collider. The branching fractions are measured to be $\mathcal{B}(\hat{I}{›}_c^{+}\to \hat{I}›\hat{I}\cdot \ddot{I}{€}^{+})=(1.84\pm 0.21(stat.)\pm 0.15(syst.))\%$ and $\mathcal{B}(\hat{I}{›}_c^{+}\to \hat{I}\pounds (1385{)}^{+}\hat{I}\cdot )=(0.91\pm 0.18(stat.)\pm 0.09(syst.))\%$, constituting the most precise measurements to date.