Search for the decay $B^0\to D{K}^{\ast 0}$ followed by $D\to K^{-}{\pi }^{+}$

Abstract

We report a study of the decay $B^0\to D{K}^{+}{\pi }^{-}$ followed by $D\to K^{-}{\pi }^{+}$, where $D$ indicates $D^0$ or ${\bar{D}}^0$. We reconstruct the $D{K}^{+}{\pi }^{-}$ state in a phase space corresponding to $D{K}^{\ast }(892{)}^0$. The CP-violating angle ${\varphi }_3$ affects its decay rate via the interference between $b\to u$ and $b\to c$ transitions. The result is obtained from a 711 ${\mathrm{fb}}^{-1}$ data sample that contains 772 $\times 10^{6}B\bar{B}$ pairs collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We measure the ratio ${\mathcal{R}}_{D{K}^{\ast 0}}\equiv \Gamma (B^0\to [K^{-}{\pi }^{+}{]}_D{K}^{+}{\pi }^{-})/\Gamma (B^0\to [K^{+}{\pi }^{-}{]}_D{K}^{+}{\pi }^{-})$ to be $(4.1_{-5.0-1.8}^{+5.6+2.8})\times 10^{-2}$, and set an upper limit of ${\mathcal{R}}_{D{K}^{\ast 0}}<0.16$ at the 95% confidence level.

References in corpus (4)

• Evidence for direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B-+ --> D(*) K(*)-+ decays
• Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-
• Measurement of CP observables in B+- --> D_CP K+- decays and constraints on the CKM angle gamma
• Measurements of branching fraction ratios and CP-asymmetries in suppressed B^- -> D(-> K^+ pi^-)K^- and B^- -> D(-> K^+ pi^-)pi^- decays

Cited by in corpus (11)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B+- --> D(*)K(*)+- decays
• Measurement of CP violation parameters in B0->D K*0 decays
• CP violation in the B system
• Constraints on the unitarity triangle angle $\gamma$ from Dalitz plot analysis of $B^0\to D{K}^{+}{\pi }^{-}$ decays
• Model-independent measurement of the CKM angle $\gamma$ using $B^0\to D{K}^{\ast 0}$ decays with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ and $K_S^0{K}^{+}{K}^{-}$
• Evidence for the suppressed decay B^- -> DK^-, D -> K^+π^-π^0
• Optimising sensitivity to $\gamma$ with $B^0\to D{K}^{+}{\pi }^{-}$, $D\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ double Dalitz plot analysis
• Measurement of the CKM angle $\gamma$ in the $B^0\to D{K}^{\ast 0}$ channel using self-conjugate $D\to K_S^0{h}^{+}{h}^{-}$ decays