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  • Observation of the decay $B^0_s \to \phi\pi^+\pi^-$ and evidence for $B^0 \to \phi\pi^+\pi^-
    Ali, S; Barlow, R. J; Bay, A; Ben-Haim, E; Bezshyiko, Ia; Blake, T; Boettcher, T; Bozzi, C; Camboni, A; Perez, D. Campora; Carbone, A; Carson, L; Cattaneo, M; Cavallero, G; Charles, M; Collins, P; Corti, G; Couturier, B; Cunliffe, S; Currie, R; De Bruyn, K; De Capua, S; De Cian, M; Deckenhoff, M; Dziurda, A; Easo, S; Evans, T; Falabella, A; Ferguson, D; Forshaw, D. C; Färber, C; Martin, L. M. Garcia; Gaspar, C; Gersabeck, M; Gibson, V; Guz, Yu; Henrard, P; Hushchyn, M; Ilten, P; Jacobsson, R; Johnson, D; Jones, C. R; Jurik, N; Khurewathanakul, C; Klaver, S; Kreplin, K; Cid, E. Lemos; Lupton, O; Lyu, X; Maguire, K; Marconi, U; Martin, M; Santos, D. Martinez; Vidal, F. Martinez; Massacrier, L. M; Meadows, B; Rodriguez, J. Molina; Morello, M. J; Müller, K; Nasteva, I; Owen, P; Pais, P. R; Parkes, C; Pugatch, V; Renaudin, V; Rodrigues, E; Perez, P. Rodriguez; Valls, P. Ruiz; Silva, J. J. Saborido; Sarti, A; Satriano, C; Schlupp, M; Serrano, J; Shears, T; Siddi, B. G; Simone, S; Spaan, B; Stemmle, S; Stone, S; Stracka, S; Swientek, K; Szczekowski, M; Tobin, M; Tonelli, D; Tsaregorodtsev, A; Ukleja, A; Vacca, C; Gomez, R. Vazquez; Veneziano, G; Volkov, V; de Vries, J. A; Sierra, C. Vázquez; Waldi, R; Walsh, J; Websdale, D; Wilkinson, M; Williams, M. P; Wright, S; Yin, H; Zhang, Y

    10/2016
    Journal Article

    Phys. Rev. D 95, 012006 (2017) The first observation of the rare decay$B^0_s \to \phi\pi^+\pi^-$ and evidence for $B^0 \to \phi\pi^+\pi^-$ are reported, using $pp$ collision data recorded by the LHCb detector at centre-of-mass energies $\sqrt{s} = 7$ and 8~TeV, corresponding to an integrated luminosity of $3{\mbox{\,fb}^{-1}}$. The branching fractions in the $\pi^+\pi^-$ invariant mass range $400<m(\pi^+\pi^-)<1600{\mathrm{\,Me\kern -0.1em V\!/}c^2}$ are $3.48\pm 0.23\pm 0.17\pm 0.35\times 10^{-6}$ and $1.82\pm 0.25\pm 0.41\pm 0.14\times 10^{-7}$ for $B^0_s \to \phi\pi^+\pi^-$ and $B^0 \to \phi\pi^+\pi^-$ respectively, where the uncertainties are statistical, systematic and from the normalisation mode $B^0_s \to \phi\phi $. A combined analysis of the $\pi^+\pi^-$ mass spectrum and the decay angles of the final-state particles identifies the exclusive decays $B^0_s \to \phi f_0(980) $, $B_s^0 \to \phi f_2(1270) $, and $B^0_s \to \phi\rho^0$ with branching fractions of $1.12\pm 0.16^{+0.09}_{-0.08}\pm 0.11\times 10^{-6}$, $0.61\pm 0.13^{+0.12}_{-0.05}\pm 0.06\times 10^{-6}$ and $2.7\pm 0.7\pm 0.2\pm 0.2\times 10^{-7}$, respectively.

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