Measurement of the CKM angle γ in B± → DK± and B± → Dπ± decays with D → KS0 h+ h

LHCb Collaboration

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Abstract

A measurement of CP-violating observables is performed using the decays B± → DK± and B± → Dπ±, where the D meson is reconstructed in one of the self-conjugate three-body final states KS0π+π and KS0K+K (commonly denoted KS0h+h). The decays are analysed in bins of the D-decay phase space, leading to a measurement that is independent of the modelling of the D-decay amplitude. The observables are inter- preted in terms of the CKM angle γ. Using a data sample corresponding to an integrated luminosity of 9 fb−1 collected in proton-proton collisions at centre-of mass energies of 7, 8, and 13 TeV with the LHCb experiment, γ is measured to be (68.7−5.1+5.2)°. The hadronic parameters rBDK, rB, δBDK, and δB, which are the ratios and strong-phase differences of the suppressed and favoured B± decays, are also reported. 

Original languageEnglish
Article number169
Number of pages36
JournalJournal of High Energy Physics
Volume2021
Issue number2
DOIs
Publication statusPublished - 19 Feb 2021

Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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