### Abstract

A flavour-tagged decay-time-dependent amplitude analysis of

*B*_{ s }^{0}→ (*K*^{+}*π*^{−})(*K*^{−}*π*^{+}) decays is presented in the*K*^{±}*π*^{∓}mass range from 750 to 1600MeV/*c*^{2}. 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*f*_{L}= 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 language | English |
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Article number | 140 |

Number of pages | 32 |

Journal | Journal of High Energy Physics |

Volume | 2018 |

Issue number | 3 |

Early online date | 23 Mar 2018 |

DOIs | |

Publication status | Published - Mar 2018 |

### Keywords

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

## Fingerprint Dive into the research topics of 'First measurement of the CP-violating phase φ<sup>dd</sup><sub>s</sub> in B<sub>s</sub><sup>o</sup> → (K+π−)(K−π<sup>+</sup>) decays'. Together they form a unique fingerprint.

## Cite this

LHCb Collaboration (2018). First measurement of the CP-violating phase φ

^{dd}_{s}in B_{s}^{o}→ (K+π−)(K−π^{+}) decays.*Journal of High Energy Physics*,*2018*(3), [140]. https://doi.org/10.1007/JHEP03(2018)140