Search for $X(3872)$ and $X(3915)$ decay into $\ddot{I}{‡}_{c1}\ddot{I}{€}^0$ in $B$ decays at Belle

Abstract

We report a search for $X(3872)$ and $X(3915)$ in $B^{+}\to \ddot{I}{‡}_{c1}\ddot{I}{€}^0{K}^{+}$ decays. We set an upper limit of $\mathcal{B}(B^{+}\to X(3872)K^{+})\times \mathcal{B}(X(3872)\to \ddot{I}{‡}_{c1}\ddot{I}{€}^0)$ $<8.1\times 10^{-6}$ and $\mathcal{B}(B^{+}\to X(3915)K^{+})\times \mathcal{B}(X(3915)\to \ddot{I}{‡}_{c1}\ddot{I}{€}^0)$ $<3.8\times 10^{-5}$ at 90\% confidence level. We also measure $\mathcal{B}(X(3872)\to \ddot{I}{‡}_{c1}\ddot{I}{€}^0)/\mathcal{B}(X(3872)\to J/\ddot{I}ˆ\ddot{I}{€}^{+}\ddot{I}{€}^{-})<0.97$ at 90\% confidence level. The results reported here are obtained from $772\times 10^6$ $B\overline{B}$ events collected at the $\hat{I}\yen (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider.

7 pages, 4 figures, submitted to PRD (RC)