Measurement of CP asymmetry in Bs0 → Ds K± decays

LHCb Collaboration

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We report the measurements of the CP -violating parameters in B s 0  → D s K± decays observed in pp collisions, using a data set corresponding to an integrated luminosity of 3.0 fb−1 recorded with the LHCb detector. We measure C f = 0.73 ± 0.14 ± 0.05, A f ΔΓ  = 0.39 ± 0.28 ± 0.15, AΔΓf¯¯¯=0.31±0.28±0.15, S f = −0.52 ± 0.20 ± 0.07, Sf¯¯¯=−0.49±0.20±0.07, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the B s 0 mixing phase, −2β s , to obtain a measurement of the CKM angle γ from B s 0  → D s K± decays, yielding γ = (128 − 22 + 17 )° modulo 180°, where the uncertainty contains both statistical and systematic contributions. This corresponds to 3.8 σ evidence for CP violation in the interference between decay and decay after mixing.
Original languageEnglish
Article number59
Number of pages28
JournalJournal of High Energy Physics
Issue number3
Early online date12 Mar 2018
Publication statusPublished - Mar 2018


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


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