The first observations of $B^0\to {\overline{D}}^{*}(2007{)}^0{K}^{+}{\pi }^{-}$ and $B_s^0\to {\overline{D}}^{*}(2007{)}^0{K}^{-}{\pi }^{+}$ decays are presented, and their branching fractions relative to that of the $B^0\to {\overline{D}}^{*}(2007{)}^0{\pi }^{+}{\pi }^{-}$ decay are reported. These modes can potentially be used to investigate the spectroscopy of charm and charm-strange resonances and to determine the angle $\gamma$ of the Cabibbo-Kobayashi-Maskawa unitarity triangle. It is also important to understand them as a source of potential background in determinations of $\gamma$ from $B^{+}\to D{K}^{+}$ and $B^0\to D{K}^{+}{\pi }^{-}$ decays. The analysis is based on a sample corresponding to an integrated luminosity of $5.4{\mathrm{fb}}^{-1}$ of proton-proton collision data at 13 TeV center-of-mass energy recorded with the LHCb detector. The ${\overline{D}}^{*}(2007{)}^0$ mesons are fully reconstructed in the ${\overline{D}}^0{\pi }^0$ and ${\overline{D}}^0\gamma$ channels with the ${\overline{D}}^0\to K^{+}{\pi }^{-}$ decay. A novel weighting method is used to subtract background while simultaneously applying an event-by-event efficiency correction to account for resonant structures in the decays.

• Received 22 December 2021
• Accepted 4 March 2022

DOI:https://doi.org/10.1103/PhysRevD.105.072005

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