Measurement of CP observables in B± → D⁽*⁾K± and B± → D⁽*⁾ π± decays

Measurements of CP observables in B± → D⁽*⁾K± and B± → D⁽*⁾ π± decays are presented, where D⁽*⁾ indicates a neutral D or D* meson that is an admixture of D⁽*⁾⁰ and D̅⁽*⁾⁰ states. Decays of the D* meson to the Dπ⁰ and Dγ final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the B candidate invariant mass distribution. Decays of the D meson are fully reconstructed in the K± π∓ , K⁺ K⁻ and π⁺ π⁻ final states. The analysis uses a sample of charged B mesons produced in pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and 2.0 fb⁻¹ taken at centre-of-mass energies of √s=7, 8 and 13 TeV, respectively. The study of B± → D* K± and B± → D* π± decays using a partial reconstruction method is the first of its kind, while the measurement of B± → D K± and B± → D π± decays is an update of previous LHCb measurements. The B± → D K± results are the most precise to date.