Measurement of Branching Fractions and Resonance Contributions for B0 -> D0bar K+ pi- and Search for B0 -> D0 K+ pi- Decays

Le résumé fourni par la source

Using 226 million $\\Upsilon(4S)\\to B\\bar{B}$ events collected with the BaBar detector at the PEP-II $e^+e^-$ storage ring at the Stanford Linear Accelerator Center, we measure the branching fraction for $B^0\\to \\bar{D}^0 K^+\\pi^-$, excluding $B^0\\to D^{*-} K^+$ to be $ {\\cal B}(B^0\\to \\bar{D}^0 K^+\\pi^-) = (88 \\pm 15 \\pm 9)\\times 10^{-6} . $ We observe $B^0\\to \\bar{D}^0 K^*(892)^0$ and $B^0\\to D_2^*(2460)^- K^+$ contributions. The branching ratio ${\\cal B}(B^0\\to D^{*-}K^+)/{\\cal B}(B^0\\to D^{*-}\\pi^+) = (7.76\\pm 0.34 \\pm 0.29)%$ is measured separately. The branching fraction for the suppressed mode $B^0\\to D^0 K^+\\pi^-$ is $ {\\cal B}(B^0\\to D^0 K^+\\pi^-) < 19 \\times 10^{-6} $ at the 90% confidence level.

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