Measurement of the branching fraction of $\hat{I}{ž}_c^0\to \hat{I}{›}_c^{+}\ddot{I}{€}^{-}$ at Belle

Abstract

Based on a data sample of 983 fb${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present the study of the heavy-flavor-conserving decay $\hat{I}{ž}_c^0\to \hat{I}{›}_c^{+}\ddot{I}{€}^{-}$ with $\hat{I}{›}_c^{+}$ reconstructed via its $p{K}^{-}\ddot{I}{€}^{+}$ decay mode. The branching fraction ratio $\mathcal{B}(\hat{I}{ž}_c^0\to \hat{I}{›}_c^{+}\ddot{I}{€}^{-})/\mathcal{B}(\hat{I}{ž}_c^0\to \hat{I}{ž}^{-}\ddot{I}{€}^{+})$ is measured to be $0.38\pm 0.04\pm 0.04$. Combing with the world average value of $\mathcal{B}(\hat{I}{ž}_c^0\to \hat{I}{ž}^{-}\ddot{I}{€}^{+})$, the branching fraction $\mathcal{B}(\hat{I}{ž}_c^0\to \hat{I}{›}_c^{+}\ddot{I}{€}^{-})$ is deduced to be $(0.54\pm 0.05\pm 0.05\pm 0.12)\%$. Here, the uncertainties above are statistical, systematic, and from $\mathcal{B}(\hat{I}{ž}_c^0\to \hat{I}{ž}^{-}\ddot{I}{€}^{+})$, respectively.

5 pages, 4 figures