Observation of Decays B0→Ds(*)+π− and B0→Ds(*)−K+
B. Aubert, R. Barate, M. Bóna, D. Boutigny et autres
We report the observation of decays ${B}^{0}\ensuremath{\rightarrow}{D}_{s}^{(*)+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${B}^{0}\ensuremath{\rightarrow}{D}_{s}^{(*)\ensuremath{-}}{K}^{+}$ in a sample of $230\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ events recorded with the BABAR detector at the SLAC PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ storage ring. We measure the branching fractions $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}_{s}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=\mathbf{(}1.3\ifmmode\pm\else\textpm\fi{}0.3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{syst})\mathbf{)}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{-}}{K}^{+})=\mathbf{(}2.5\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})\mathbf{)}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}_{s}^{*+}{\ensuremath{\pi}}^{\ensuremath{-}})=\mathbf{(}2.8\ifmmode\pm\else\textpm\fi{}0.6(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{syst})\mathbf{)}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}_{s}^{*\ensuremath{-}}{K}^{+})=\mathbf{(}2.0\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{syst})\mathbf{)}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. The significances of …
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