Measurements of the absolute branching fractions of $D^{0(+)}\to K\bar{K}\ddot{I}€\ddot{I}€$ decays

Abstract

Based on 2.93~fb${}^{-1}$ $e^{+}{e}^{-}$ collision data taken at center-of-mass energy of 3.773 GeV by the BESIII detector, we report the measurements of the absolute branching fractions of $D^0\to K^{+}{K}^{-}\ddot{I}{€}^0\ddot{I}{€}^0$, $D^0\to K_S^0{K}_S^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$, $D^0\to K_S^0{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$, $D^0\to K_S^0{K}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$, $D^{+}\to K^{+}{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$, $D^{+}\to K_S^0{K}^{+}\ddot{I}{€}^0\ddot{I}{€}^0$, $D^{+}\to K_S^0{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}$, $D^{+}\to K_S^0{K}^{+}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$, and $D^{+}\to K_S^0{K}_S^0\ddot{I}{€}^{+}\ddot{I}{€}^0$. The decays $D^0\to K^{+}{K}^{-}\ddot{I}{€}^0\ddot{I}{€}^0$, $D^0\to K_S^0{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$, $D^0\to K_S^0{K}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$, $D^{+}\to K_S^0{K}_S^0\ddot{I}{€}^{+}\ddot{I}{€}^0$, and $D^{+}\to K_S^0{K}^{+}\ddot{I}{€}^0\ddot{I}{€}^0$ are observed for the first time. The branching fractions of the decays $D^0\to K_S^0{K}_S^0\ddot{I}{€}^{+}\ddot{I}{€}^{-}$, $D^{+}\to K^{+}{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^0$, $D^{+}\to K_S^0{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{+}$, and $D^{+}\to K_S^0{K}^{+}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ are measured with improved precision compared to the world-average values.

11 pages, 5 figures