Measurement of $B \to D_s^{(*)} Kπ$ branching fractions

Details Measurement of $B \to D_s^{(*)} Kπ$ branching fractions Measurement of $B \to D_s^{(*)} Kπ$ branching fractions

2009-03-28

arxiv.org/abs/0903.4956v1

Phys.Rev.D80:052005,2009

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 4 figures, submitted to PRD

Scientific paper

10.1103/PhysRevD.80.052005

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

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