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

Abstract

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. The branching fractions of $B^0\to D^{+}{D}^{-}$, $B^{-}\to D^0{D}^{-}$ and $B^{-}\to D^0{D}^{\ast -}$ are found to be $(3.21\pm 0.57\pm 0.48)\times 10^{-4}$, $(5.62\pm 0.82\pm 0.65)\times 10^{-4}$ and $(4.59\pm 0.72\pm 0.56)\times 10^{-4}$, respectively. Charge asymmetries in the $B^{-}\to D^0{D}^{-}$ and $B^{-}\to D^0{D}^{\ast -}$ channels are consistent with zero.

9 pages, 2 figures, KEK Preprint 2004-99, Belle Prerpint 2005-3, submitted to PRL

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• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• CP Asymmetries in B Decays with New Physics in Decay Amplitudes
• Measurement of the CP-Violating Asymmetry Amplitude sin2beta
• Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System
• Towards Determining ϕ_1 with B\to D^(*)\bar{D}^(*)
• Search for CP violation in the decay B0->D*+-D-+
• Measurement of the Branching Fraction and CP-violating Asymmetries in Neutral B Decays to D*+-D-+
• Observation of the decay B^0->D+D*-
• Measurement of the Branching Fraction and CP Content for the Decay B0 --> D*+ D*-

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