Observation of $B^0\to D^{+}{D}^{-}$, $B^{-}\to D^0{D}^{-}$ and $B^{-}\to D^0{D}^{\ast -}$ decays

G. Majumder

We report the first observation of the decay modes $B^0\to D^{+}{D}^{-}$, $B^{-}\to D^0{D}^{-}$ and $B^{-}\to D^0{D}^{\ast -}$ based on 152 $\times$ 10${}^6$ $B\bar{B}$ events collected at KEKB. T…