Observation of $\overline{B^0}$ -> DsJ*(2317)+ K- decay

Abstract

The decays $\overline{B^0}\to D_{sJ}^{+}{K}^{-}$ and $\overline{B^0}\to D_{sJ}^{-}{\pi }^{+}$ are studied for the first time. A significant signal is observed in the $\overline{B^0}\to D_{sJ}^{\ast }(2317{)}^{+}{K}^{-}$ decay channel with $\mathcal{B}(\overline{B^0}\to D_{sJ}^{\ast }(2317{)}^{+}{K}^{-})\times \mathcal{B}(D_{sJ}^{\ast }(2317{)}^{+}\to D_s^{+}{\pi }^0)=(5.3_{-1.3}^{+1.5}\pm 0.7\pm 1.4)\times 10^{-5}$. No signals are observed in the $\overline{B^0}\to D_{sJ}^{\ast }(2317{)}^{-}{\pi }^{+}$, $\overline{B^0}\to D_{sJ}(2460{)}^{+}{K}^{-}$ and $\overline{B^0}\to D_{sJ}(2460{)}^{-}{\pi }^{+}$ decay modes, and upper limits are obtained. The analysis is based on a dataset of 140 fb${}^{-1}$ collected by the Belle experiment at the asymmetric $e^{+}{e}^{-}$ collider KEKB.

9 pages, 2 figures, submitted to PRL