First measurement of the CP-violating phase ϕdd¯¯¯s in B0s→(K+π−)(K−π+) decays

Авторы: Бережной А.В., Горелов И.В., Лефлат А.К., Никитин Н.В., Саврина Д.В., Волков В.Ю., Жуков В.Ю., LHCb Collaboration
Журнал: Journal of High Energy Physics
Том: 2018
Номер: 3
Год издания: 2018
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
DOI: 10.1007/jhep03(2018)140
Аннотация: A flavour-tagged decay-time-dependent amplitude analysis of B0s → (K+π−)(K−π+) 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.
Добавил в систему: Бережной Александр Викторович

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