Observation of the suppressed ADS modes $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{\pi }^{+}{\pi }^{-}{]}_D{K}^{\pm }$ and $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{\pi }^{+}{\pi }^{-}{]}_D{\pi }^{\pm }$

Abstract

An analysis of $B^{\pm }\to D{K}^{\pm }$ and $B^{\pm }\to D{\pi }^{\pm }$ decays is presented where the $D$ meson is reconstructed in the four-body final state $K^{\pm }{\pi }^{\mp }{\pi }^{+}{\pi }^{-}$. Using LHCb data corresponding to an integrated luminosity of $1.0{\mathrm{fb}}^{-1}$, first observations are made of the suppressed ADS modes $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{\pi }^{+}{\pi }^{-}{]}_D{K}^{\pm }$ and $B^{\pm }\to [{\pi }^{\pm }{K}^{\mp }{\pi }^{+}{\pi }^{-}{]}_D{\pi }^{\pm }$ with a significance of $5.1\sigma$ and greater than $10\sigma$, respectively. Measurements of CP asymmetries and CP-conserving ratios of partial widths from this family of decays are also performed. The magnitude of the ratio between the suppressed and favoured $B^{\pm }\to D{K}^{\pm }$ amplitudes is determined to be $r_B^K=0.097\pm 0.011$.

14 pages, 3 figures. Minor textual changes after journal acceptance

References in corpus (4)

• PYTHIA 6.4 Physics and Manual
• Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B+- --> D(*)K(*)+- decays
• A model-independent Dalitz plot analysis of $B^{\pm }\to D{K}^{\pm }$ with $D\to K_{\mathrm{S}}^0{h}^{+}{h}^{-}$ ($h=\pi ,K$) decays and constraints on the CKM angle $\gamma$
• Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays

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