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  • Amplitude analysis and branching fraction measurement of Bs->J/\psi K+K
    collaboration, LHCb; Alves, A A; Amato, S; Archilli, F; Artamonov, A; Back, J J; Belyaev, I; Bifani, S; Bobrov, A; van den Brand, J; M Calvo Gomez; Campana, P; Carson, L; Cattaneo, M; Cliff, H V; Cogan, J; Corti, G; De Bonis, I; De Bruyn, K; De Silva, W; Deckenhoff, M; Degaudenzi, H; Dijkstra, H; P Diniz Batista; Dogaru, M; Dziurda, A; Dzyuba, A; Eitschberger, U; Elsby, D; Farinelli, C; Farry, S; Fontanelli, F; Frei, C; A Gallas Torreira; Gaspar, C; Gersabeck, E; Göbel, C; Hall, S; Hunt, P; Hutchcroft, D; Hynds, D; Jaton, P; Jing, F; Johnson, D; Kaballo, M; Kandybei, S; Kreps, M; Kucharczyk, M; Kvaratskheliya, T; Lai, A; Lambert, R W; Lanfranchi, G; Latham, T; J van Leerdam; Lefèvre, R; J von Loeben; Lopes, J H; Malde, S; Martin, L; Mazurov, A; McNulty, R; M -N Minard; Moran, D; Muheim, F; Muresan, R; Nakada, T; Patel, G D; Perrin-Terrin, M; A Puig Navarro; Rauschmayr, N; Roa Romero, D A; Rodrigues, E; Roiser, S; Savrie, M; Savrina, D; Schmidt, B; Schopper, A; Sciascia, B; Senderowska, K; Serra, N; Shapkin, M; Shcheglov, Y; Smith, N A; Smith, E; Sobczak, K; Thomas, C; M Ubeda Garcia; Veneziano, G; Vesterinen, M; Viaud, B; Vilasis-Cardona, X; Vorobyev, V; Watson, N K; Wiechczynski, J; Williams, M P; Williams, M; Wishahi, J; Wotton, S A; Xie, Y; Zavertyaev, M

    arXiv.org, 02/2013
    Paper, Journal Article

    An amplitude analysis of the final state structure in the Bs->J/\psi K+K- decay mode is performed using 1.0/fb of data collected by the LHCb experiment in 7 TeV center-of-mass energy pp collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. Resonant structures are observed in the K+K- mass spectrum as well as a significant non-resonant S-wave contribution. The largest resonant component is the \phi(1020), accompanied by f0(980), f'2(1525), and four additional resonances. The overall branching fraction is measured to be B(Bs->J/\psi K+K-)=(7.70 +/-0.08 +/- 0.39 +/- 0.60)x 10^(-4), where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of Bs to B- mesons produced. The mass and width of the f'2(1525) are measured to be 1522.2 +/- 2.8^{+5.3}_{-2.0} MeV and 84 +/- 6^{+10}_{-5} MeV, respectively. The final state fractions of the other resonant states are also reported.

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