Measurement of Branching Fractions and Resonance Contributions for B0→D¯0K+π− and Search for B0→D0K+π− Decays

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Using $226\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ events collected with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ storage ring at the Stanford Linear Accelerator Center, we measure the branching fraction for ${B}^{0}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, excluding ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{K}^{+}$, to be $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(88\ifmmode\pm\else\textpm\fi{}15\ifmmode\pm\else\textpm\fi{}9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We observe ${B}^{0}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{*}(892{)}^{0}$ and ${B}^{0}\ensuremath{\rightarrow}{D}_{2}^{*}(2460{)}^{\ensuremath{-}}{K}^{+}$ contributions. The ratio of branching fractions $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{K}^{+})/\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\pi}}^{+})=(7.76\ifmmode\pm\else\textpm\fi{}0.34\ifmmode\pm\else\textpm\fi{}0.29)%$ is measured separately. The branching fraction for the suppressed mode ${B}^{0}\ensuremath{\rightarrow}{D}^{0}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ is $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{D}^{0}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})<19\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at the 90% confidence level.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.