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  • Observation of the decay B ¯ s 0 → χ c 2 K + K − \[ {\overline{B}}_s^0\to {\chi}_{c2}{K}^{+}{K}^{-} \] in the ϕ mass region
    Adeva, B; P Alvarez Cartelle; Amato, S; Andrews, J E; Aslanides, E; Baldini, W; Bay, A; Belous, K; Bertolin, A; Blusk, S; Boettcher, T; Cadeddu, S; Campora Perez, D H; Cassina, L; S-G Chitic; Ciambrone, P; Cliff, H V; Colombo, T; Corvo, M; Craik, D C; M Cruz Torres; Da Silva, C L; Davis, A; De Serio, M; Demmer, M; Dey, B; P Di Nezza; Douglas, L; Dutta, D; Firlej, M; Fitzpatrick, C; Fontanelli, F; Frei, C; Gerstel, D; Gorelov, I V; Greim, R; Grillo, L; Grünberg, O; Haines, S C; Harrison, T; Hicheur, A; R Hidalgo Charman; Idzik, M; John, M; Jones, C R; Karacson, M; Kopecna, R; Lacarrere, D; Lafferty, G; Leroy, O; Liang, X; Lindner, R; Lisovskyi, V; Loi, A; Lovell, G H; Lupato, A; Lupton, O; Martinelli, M; D Martinez Santos; Mazurov, A; Merli, A; Michielin, E; Morris, A B; Ogilvy, S; Oyanguren, A; Palano, A; Pellegrino, A; Penso, G; Pescatore, L; Pietrzyk, B; Polci, F; Potterat, C; Pugatch, V; Rangel, M S; Ratnikov, F; M Ravonel Salzgeber; Robert, A; Rodrigues, E; Rollings, A; Savrina, D; Schmelzer, T; Schreiner, H F; Shekhtman, L; Smith, I T; Spradlin, P; Stepanova, M; Szymanski, M; Teubert, F; Thomas, E; Tully, A; Vernet, M; M Vieites Diaz; Waldi, R; Wang, J; Websdale, D; Wilkinson, G; Witek, M; Zarebski, K A; Zhang, L; Zucchelli, S

    The journal of high energy physics, 08/2018, Letnik: 2018, Številka: 8
    Journal Article

    The B¯s0→χc2K+K−\ {\overline{B}}_s^0\to {\chi}_{c2}{K}^{+}{K}^{-} \ decay mode is observed and its branching fraction relative to the corresponding χc1 decay mode, in a ±15 MeV/c2 window around the ϕ mass, is found to beℬB¯s0→χc2K+K−ℬB¯s0→χc1K+K−=17.1±3.1±0.4±0.9%,\ \frac{\mathrm{\mathcal{B}}\left({\overline{B}}_s^0\to {\chi}_{c2}{K}^{+}{K}^{-}\right)}{\mathrm{\mathcal{B}}\left({\overline{B}}_s^0\to {\chi}_{c1}{K}^{+}{K}^{-}\right)}=\left(17.1 \pm 3.1\pm 0.4\pm 0.9\right)\%, \where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative χc decays. The decay mode B¯s0→χc1K+K−\ {\overline{B}}_s^0\to {\chi}_{c1}{K}^{+}{K}^{-} \ allows the Bs0 mass to be measured asmBs0=5366.83±0.25±0.27MeV/c2,\ m\left({B}_s^0\right)=5366.83\pm 0.25\pm 0.27\ \mathrm{M}\mathrm{e}\mathrm{V}/{c}^2, \where the first uncertainty is statistical and the second systematic. A combination of this result with other LHCb determinations of the Bs0 mass is made.

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