Measurement of CP observables in B± → D(*)K± and B± → D(*) π ± decays using two-body D final states

LHCb Collaboration

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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 Dπ0 and Dγ 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 → Kπ± decays are the first of their kind, and a first observation of the B± → (Dπ0)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. 

Original languageEnglish
Article number81
Number of pages36
JournalJournal of High Energy Physics
Volume2021
Issue number4
DOIs
Publication statusPublished - 9 Apr 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).

Keywords

  • B physics
  • CKM angle gamma
  • CP violation
  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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