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  • Amplitude analysis of the B s 0 → K ∗ 0 K ¯ ∗ 0 \[ {B}_{(s)}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] decays and measurement of the branching fraction of the B 0 → K ∗ 0 K ¯ ∗ 0 \[ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \] decay
    P Alvarez Cartelle; Amato, S; Artamonov, A; Audurier, B; Balagura, V; Batozskaya, V; Battig, A; Belous, K; Bertolin, A; Bhasin, S; Blusk, S; Boettcher, T; Bozzi, C; Cadeddu, S; Campora Perez, D H; Chubykin, A; Clemencic, M; Cowan, G A; De Simone, P; Dean, W; Decamp, D; Douglas, L; Féo, M; Filippov, S; Fiutowski, T; ty, R; Funk, W; Gambetta, S; Göbel, C; Gomes, A; Guth, A; Haines, S C; Hamilton, B; Hill, D; Hopchev, P H; Humair, T; Ibis, P; Ilten, P; Inglessi, A; Inyakin, A; Jashal, B K; Jost, B; Karodia, S; Kelsey, M; Krupa, W; Kvaratskheliya, T; Langenbruch, C; P-R, Li; Loh, D; Mackowiak, P; Maguire, K; Malde, S; Malinin, A; Mancinelli, G; Marangotto, D; Martellotti, G; Matiunin, V; McNulty, R; Meinert, N; Mombächer, T; Monteil, S; Murphy, C H; Nanut, T; Nasteva, I; Neubert, S; Ossowska, A; Ovsiannikova, T; Oyanguren, A; Papanestis, A; Pearce, A; Pereima, D; Pinci, D; Polyakov, I; Robert, A; C Santamarina Rios; Satriano, C; Schmelzer, T; Schopper, A; Sciascia, B; Slater, M W; Smith, I T; Spradlin, P; Stagni, F; Stefko, P; Strokov, S; Sun, J; Teubert, F; Tisserand, V; Tomassetti, L; R Vazquez Gomez; C Vázquez Sierra; Vecchi, S; Veltri, M; Viana Barbosa, J V; Viemann, H; Wang, Y; Williams, M; Williams, T; Z Xu; J Yu

    The journal of high energy physics, 07/2019, Letnik: 2019, Številka: 7
    Journal Article

    The B0→K∗0K¯∗0\ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \ and Bs0→K∗0K¯∗0\ {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \ decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3 fb−1. An untagged and timeintegrated amplitude analysis of B(s)0 → (K+π−)(K−π+) decays in two-body invariant mass regions of 150 MeV/c2 around the K∗0 mass is performed. A stronger longitudinal polarisation fraction in the B0→K∗0K¯∗0\ {B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \ decay, fL = 0.724 ± 0.051 (stat) ± 0.016 (syst), is observed as compared to fL = 0.240 ± 0.031 (stat) ± 0.025 (syst) in the Bs0→K∗0K¯∗0\ {B}_s^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0} \ decay. The ratio of branching fractions of the two decays is measured and used to determine ℬB0→K∗0K¯∗0=8.0±0.9stat±0.4syst×10−7\ \mathrm{\mathcal{B}}\left({B}^0\to {K}^{\ast 0}{\overline{K}}^{\ast 0}\right)=\left(8.0\pm 0.9\left(\mathrm{stat}\right)\pm 0.4\left(\mathrm{syst}\right)\right)\times {10}^{-7} \.

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