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Publication - Dr Jaap Velthuis

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


    Adinolfi, M, Buchanan, E, Chapman, M, Dalseno, J, Harnew, S, Kariuki, J, Maddrell-Mander, S, Naik, P, Petridis, K, Pomery, G, Price, E, Prouve, C, Quagliani, R, Rademacker, J, Richards, S, Saunders, D, Skidmore, N, Velthuis, J & , 2018, ‘First measurement of the CP-violating phase φdds in Bso → (K+π−)(K−π+) decays’. Journal of High Energy Physics, vol 2018.


    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.

    Full details in the University publications repository