Measurement of the CKM angle γ and Bs0‐B¯s0 mixing frequency with Bs0→Ds∓π±π∓ decays

The Lhcb Collaboration

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Abstract

The CKM angle γ is measured for the first time from mixing-induced CP violation between Bs0→Ds∓K±π±π∓ and B¯s0→Ds±K∓π∓π± decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 fb−1 recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the CP-violating weak phase γ − 2βs and, subsequently, γ by taking the Bs0‐B¯s0 mixing phase βs as an external input. The measurement yields γ = (44 ± 12)° modulo 180°, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yields γ=(44−13+20)° modulo 180°. Moreover, the Bs0‐B¯s0 oscillation frequency is measured from the flavour-specific control channel Bs0→Ds−π+π+π− to be ∆ms = (17.757 ± 0.007(stat) ± 0.008(syst)) ps−1, consistent with and more precise than the current world-average value. [Figure not available: see fulltext.]

Original languageEnglish
Article number137
Pages (from-to)1-46
Number of pages46
JournalJournal of High Energy Physics
Volume2021
Issue number3
Early online date15 Mar 2021
DOIs
Publication statusPublished - Mar 2021

Bibliographical note

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

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

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

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