First measurement of the CP-violating phase φdds in Bso → (K+π−)(K−π+) decays

LHCb Collaboration

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A flavour-tagged decay-time-dependent amplitude analysis of B s 0  → (K+π)(Kπ+) decays is presented in the K±π mass range from 750 to 1600MeV/c2. The analysis uses pp collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb−1. Several quasi-two-body decay modes are considered, corresponding to K±π combinations with spin 0, 1 and 2, which are dominated by the K 0 * (800)0 and K 0 * (1430)0, the K*(892)0 and the K 2 * (1430)0 resonances, respectively. The longitudinal polarisation fraction for the B0s→K∗(892)∘K¯¯¯¯¯∗(892)0 decay is measured as fL = 0.208 ± 0.032 ± 0.046, where the first uncertainty is statistical and the second is systematic. The first measurement of the mixing-induced CP-violating phase, ϕdd¯¯¯s, in b→dd¯¯¯s transitions is performed, yielding a value of ϕdd¯¯¯s=−0.10±0.13(stat)±0.14 (syst) rad.
Original languageEnglish
Article number140
Number of pages32
JournalJournal of High Energy Physics
Issue number3
Early online date23 Mar 2018
Publication statusPublished - Mar 2018


  • CP violation
  • Flavour Changing Neutral Currents
  • B physics
  • Oscillation
  • Hadron-Hadron scattering (experiments)


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