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  • First measurement of the CP-violating phase ϕ s d d ¯ in B s 0  → (K + π −)(K − π +) decays
    Adeva, B; Akar, S; Alessio, F; P Alvarez Cartelle; Amhis, Y; Bediaga, I; Bel, L J; Belloli, N; Beranek, S; Bettler, M O; Blusk, S; Carson, L; Chatzikonstantinidis, G; Chubykin, A; Clarke, P E L; Coco, V; Comerma-Montells, A; Contu, A; Cowan, G A; De Bruyn, K; De Miranda, J M; Dendek, A; Deschamps, O; Dovbnya, A; Dzhelyadin, R; Eidelman, S; Esen, S; Fernandez, G; Ferrari, F; Frank, M; Garcia Martin, L M; Gorelov, I V; Gruberg Cazon, B R; Gys, T; Haefeli, G; Hecker, M; Heister, A; Huang, W; Ibis, P; Ilten, P; Jawahery, A; Kecke, M; Kenzie, M; Klaver, S; Krokovny, P; Langenbruch, C; Lesiak, T; Longstaff, I; Maev, O; Malinin, A; Mancinelli, G; Maratas, J; Marconi, U; Matteuzzi, C; Mauri, A; Mead, J V; Meadows, B; Merk, M; Mountain, R; Muheim, F; Müller, D; Nandakumar, R; Nandi, A; Palano, A; Papanestis, A; Penso, G; Pietrzyk, B; Polci, F; Poslavskii, S; Pullen, H; Qian, W; Rademacker, J H; M Ramos Pernas; Ratnikov, F; Reboud, M; Renaudin, V; Rinnert, K; Robbe, P; Ruf, T; C Santamarina Rios; Schmelzer, T; Sepulveda, E S; Seyfert, P; Simone, S; Storaci, B; Tayduganov, A; Tellarini, G; Traill, M; Uwer, U; Vagner, A; Valassi, A; Vecchi, S; Vesterinen, M; Volkov, V; Vorobyev, A; C Vázquez Sierra; Wicht, J; Wimberley, J; Zhang, L; Zucchelli, S

    The journal of high energy physics, 03/2018, Letnik: 2018, Številka: 3
    Journal Article

    A flavour-tagged decay-time-dependent amplitude analysis of Bs0 → (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 K0*(800)0 and K0*(1430)0, the K*(892)0 and the K2*(1430)0 resonances, respectively. The longitudinal polarisation fraction for the Bs0→K∗892°K¯∗8920 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, ϕsdd¯, in b→dd¯s transitions is performed, yielding a value of ϕsdd¯=−0.10±0.13stat±0.14 (syst) rad.

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