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  • Quantum numbers of the $X(3872)$ state and orbital angular momentum in its $\rho^0 J\psi$ decay
    Amato, S; Archilli, F; Artamonov, A; Belyaev, I; Bifani, S; Bocci, V; Bondar, A; Bozzi, C; Cardini, A; Akiba, K. Carvalho; Chiapolini, N; Clarke, P. E. L; Cliff, H. V; Couturier, B; De Bonis, I; De Cian, M; De Silva, W; Deckenhoff, M; Eisenhardt, S; Falabella, A; Albor, V. Fernandez; Filippov, S; Fontana, M; Frank, M; Furfaro, E; Torreira, A. Gallas; Gandini, P; Gibson, V; Golutvin, A; Gordon, H; Guz, Yu; Gys, T; Hampson, T; Hartmann, T; Hopchev, P; Idzik, M; Jans, E; John, M; Jones, C. R; Korolev, M; Kravchuk, L; Kruse, F; La Thi, V. N; Lacarrere, D; Lafferty, G; Lees, J. -P; Li, Y; Liles, M; Asamar, E. Lopez; Lopez-March, N; Lucchesi, D; Luisier, J; Luo, H; Machikhiliyan, I. V; Müller, K; Muryn, B; Nasteva, I; Neufeld, N; Nicol, M; Nikodem, T; Novoselov, A; Okhrimenko, O; Owen, P; Palutan, M; Patel, M; Pellegrino, A; Altarelli, M. Pepe; Trigo, E. Perez; Pietrzyk, B; Pinci, D; Polok, G; Poluektov, A; Popov, D; Qian, W; Reid, M. M; Molina, V. Rives; Saitta, B; Sarti, A; Semennikov, A; Shatalov, P; Shevchenko, O; Shires, A; Skwarnicki, T; Soomro, F; Stagni, F; Szczekowski, M; Szumlak, T; T'Jampens, S; Teodorescu, E; Torr, N; Tourneur, S; Vecchi, S; Vieira, D; Voß, C; Wallace, R; Websdale, D; Wotton, S. A; Yuan, X; Zangoli, M; Zhang, Y

    04/2015
    Journal Article

    Phys. Rev. D92, 011102 (2015) Angular correlations in $B^+\to X(3872) K^+$ decays, with $X(3872)\to \rho^0 J/\psi$, $\rho^0\to\pi^+\pi^-$ and $J/\psi \to\mu^+\mu^-$, are used to measure orbital angular momentum contributions and to determine the $J^{PC}$ value of the $X(3872)$ meson. The data correspond to an integrated luminosity of 3.0 fb$^{-1}$ of proton-proton collisions collected with the LHCb detector. This determination, for the first time performed without assuming a value for the orbital angular momentum, confirms the quantum numbers to be $J^{PC}=1^{++}$. The $X(3872)$ is found to decay predominantly through S wave and an upper limit of $4\%$ at $95\%$ C.L. is set on the fraction of D wave.

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