Measurement of CP asymmetry in Bs0 → Ds K± decays

LHCb Collaboration

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
168 Downloads (Pure)


We report the measurements of the CP -violating parameters in Bs0 → DsK± 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 Cf = 0.73 ± 0.14 ± 0.05, Af ΔΓ = 0.39 ± 0.28 ± 0.15, AΔΓ=0.31±0.28±0.15, Sf = −0.52 ± 0.20 ± 0.07, S= − 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 Bs0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs0 → Ds 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
Publication statusPublished - 12 Mar 2018


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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Measurement of CP asymmetry in Bs0 → Ds K± decays'. Together they form a unique fingerprint.

Cite this