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collaboration, LHCb; Amato, S; Archilli, F; Artamonov, A; Back, J J; Belyaev, I; Bifani, S; Bocci, V; Bondar, A; Bozzi, C; Brook, N H; Cardini, A; Chiapolini, N; Couturier, B; De Bonis, I; De Cian, M; De Silva, W; Deckenhoff, M; Donleavy, S; Eisenhardt, S; Falabella, A; Filippov, S; Fontana, M; Frank, M; Furfaro, E; Gandini, P; Gibson, V; Golutvin, A; Gordon, H; Granado Cardoso, L A; Gys, T; Hampson, T; Hartmann, T; Hopchev, P; Idzik, M; Jans, E; John, M; Jones, C R; Karbach, T M; Kenyon, I R; Korolev, M; Kravchuk, L; Kruse, F; Lacarrere, D; Lafferty, G; Liles, M; E Lopez Asamar; Lopez-March, N; Lucchesi, D; Luisier, J; Luo, H; Müller, K; Muryn, B; Nasteva, I; Neufeld, N; Nguyen, A D; Nicol, M; Nikodem, T; Novoselov, A; Okhrimenko, O; Owen, P; Palutan, M; Patel, M; A Pazos Alvarez; Pellegrino, A; M Pepe Altarelli; Pérez-Calero Yzquierdo, A; Pietrzyk, B; Pinci, D; Polok, G; Poluektov, A; Popov, D; Qian, W; A Romero Vidal; Saitta, B; Sarti, A; Semennikov, A; Shatalov, P; Shevchenko, O; Shires, A; R Silva Coutinho; Skwarnicki, T; Soler, F J P; Soomro, F; Stagni, F; Szczekowski, M; Szumlak, T; T'Jampens, S; Teodorescu, E; Torr, N; Tourneur, S; Tran, M T; Vecchi, S; Vieira, D; C Vo\ss; Wallace, R; Websdale, D; Yuan, X; Zangoli, M; Zhang, Y
arXiv.org, 02/2013Paper, Journal Article
The quantum numbers of the X(3872) meson are determined to be JPC = 1++ based on angular correlations in B+ to X(3872) K+ decays, where X(3872) to pi+pi- J/psi and J/psi to \mu+\mu-. The data correspond to 1.0 fb-1 of pp collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements, JPC=2-+, is rejected with a confidence level equivalent to more than eight Gaussian standard deviations using the likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the X(3872) state.
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