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 meson and anti-meson states. Decays of the D(*) meson to the D π0 and D γ final states are partially reconstructed without inclusion of the neutral pion or photon. Decays of the D meson are reconstructed in the K± π∓, K+ K−, and π+ π− final states. The analysis uses a sample of charged B mesons produced in proton-proton collisions and collected with the LHCb experiment, corresponding to integrated luminosities of 2.0, 1.0, and 5.7 fb^−1 taken at centre-of-mass energies of 7, 8, and 13 TeV, respectively. The measurements of partially reconstructed B± → D(*) K± and B± → D(*) π± with D → K∓ π± decays are the first of their kind, and a first observation of the B± → (D π0)_D* π± decay is made with a significance of 6.1 standard deviations. All CP observables are measured with world-best precision, and in combination with other LHCb results will provide strong constraints on the CKM angle γ.
Measurement of CP Observables in B± → D(*) K± and B± → D(*) π± Decays Using Two-Body D Final States
Capriotti, L.;
2021
Abstract
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 meson and anti-meson states. Decays of the D(*) meson to the D π0 and D γ final states are partially reconstructed without inclusion of the neutral pion or photon. Decays of the D meson are reconstructed in the K± π∓, K+ K−, and π+ π− final states. The analysis uses a sample of charged B mesons produced in proton-proton collisions and collected with the LHCb experiment, corresponding to integrated luminosities of 2.0, 1.0, and 5.7 fb^−1 taken at centre-of-mass energies of 7, 8, and 13 TeV, respectively. The measurements of partially reconstructed B± → D(*) K± and B± → D(*) π± with D → K∓ π± decays are the first of their kind, and a first observation of the B± → (D π0)_D* π± decay is made with a significance of 6.1 standard deviations. All CP observables are measured with world-best precision, and in combination with other LHCb results will provide strong constraints on the CKM angle γ.| File | Dimensione | Formato | |
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2021-AR-15-Meas_of_CP_Obs_in_Bpm_to_Dstar_Kpm_and-JHEP.pdf
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