Measurement of $B\to D_s^{(\ast )}K\pi$ branching fractions

Abstract

We report a measurement of the exclusive $B^{+}$ meson decay to the $D_s^{(\ast )-}{K}^{+}{\pi }^{+}$ final state using $657\times 10^{6}B\overline{B}$ pairs collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We use $D_s^{\ast -}\to D_s^{-}\gamma$ and the $D_s^{-}\to \varphi {\pi }^{-}$, $\overline{K^{\ast }}(892{)}^0{K}^{-}$ and $K_S^0{K}^{-}$ decay modes for $D_s^{(\ast )}$ reconstruction and measure the following branching fractions: $\mathcal{B}(B^{+}\to D_s^{-}{K}^{+}{\pi }^{+})=(1.94_{-0.08}^{+0.09}(\mathrm{s}tat{)}_{-0.20}^{+0.20}(syst)\pm 0.17(\mathcal{B}))\times 10^{-4}$ and $\mathcal{B}(B^{+}\to D_s^{\ast -}{K}^{+}{\pi }^{+})=(1.47_{-0.14}^{+0.15}(\mathrm{s}tat{)}_{-0.19}^{+0.19}(\mathrm{s}yst)\pm 0.13(\mathcal{B}))\times 10^{-4}$. The uncertainties are due to statistics, experimental systematic errors and uncertainties of intermediate branching fractions, respectively.

arXiv comment10 pages, 4 figures, submitted to PRD

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• Observation of tree-level B decays with $s\bar{s}$ Production from Gluon Radiation
• The role of $D^{\star \star }$ in $B^{-}\to D_s^{+}{K}^{-}{\pi }^{-}$

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