The first observation of the decay $B^0\to D^0{\overline{D}}^0{K}^{+}{\pi }^{-}$ is reported using proton-proton collision data corresponding to an integrated luminosity of $4.7{\mathrm{fb}}^{-1}$ collected by the LHCb experiment in 2011, 2012 and 2016. The measurement is performed in the full kinematically allowed range of the decay outside of the $D^{*-}$ region. The ratio of the branching fraction relative to that of the control channel $B^0\to D^{*-}{D}^0{K}^{+}$ is measured to be $\mathcal{R}=(14.2\pm 1.1\pm 1.0)\%$, where the first uncertainty is statistical and the second is systematic. The absolute branching fraction of $B^0\to D^0{\overline{D}}^0{K}^{+}{\pi }^{-}$ decays is thus determined to be $\mathcal{B}(B^0\to D^0{\overline{D}}^0{K}^{+}{\pi }^{-})=(3.50\pm 0.27\pm 0.26\pm 0.30)\times {10}^{-4}$, where the third uncertainty is due to the branching fraction of the control channel. This decay mode is expected to provide insights to spectroscopy and the charm-loop contributions in rare semileptonic decays.

中文翻译：

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衰减B0→D0D¯K+ 0π−的初步观察

衰减的首次观察 ${乙}^0\to d^0{\overline{d}}^0{ķ}^{+}{\pi }^{-}$ 使用质子-质子碰撞数据报告了质子-质子碰撞数据 $4.7{\mathrm{fb}}^{-\mathrm{1个}}$ 由LHCb实验在2011年，2012年和2016年收集。测量是在运动学允许的整个运动范围之内进行的。 $d^{*-}$地区。分支分数与控制通道的比率${乙}^0\to d^{*-}{d}^0{ķ}^{+}$ 被测量为 $\mathcal{[R}=（14.2\pm 1.1\pm 1.0）％$，其中第一个不确定性是统计性的，第二个不确定性是系统性的。绝对支化分数${乙}^0\to d^0{\overline{d}}^0{ķ}^{+}{\pi }^{-}$ 因此确定衰变为 $\mathcal{乙}（{乙}^0\to d^0{\overline{d}}^0{ķ}^{+}{\pi }^{-}）=（3.50\pm 0.27\pm 0.26\pm 0.30）\times {10}^{-4}$，其中第三不确定性是由于控制通道的分支分数所致。该衰减模式有望为光谱学和罕见半轻子衰减中的魅力环贡献提供见解。