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Alkhazov, G; Andreassen, R; Andrews, J E; Aslanides, E; Beaucourt, L; Benson, S; Bird, T; Bondar, A; Britsch, M; Buytaert, J; Campana, P; Carranza-Mejia, H; Ciezarek, G; Corti, G; Cruz Torres, M; David, P N Y; Davis, A; De Cian, M; Deckenhoff, M; Del Buono, L; Di Canto, A; Dosil Suárez, A; Dujany, G; Eitschberger, U; Evans, T; Fiorini, M; Francisco, O; Garra Tico, J; Gaspar, C; Gavardi, L; Golutvin, A; Grecu, A; Hadjivasiliou, C; Hennessy, K; Hill, D; Hussain, N; Hynds, D; Jaton, P; Jost, B; Kelsey, M; Khurewathanakul, C; Kochebina, O; Komarov, I; Kucharczyk, M; La Thi, V N; Lazzeroni, C; Li, Y; Liu, B; Lopez-March, N; Lu, H; Lupton, O; Malde, S; Maratas, J; Marin Benito, C; Matev, R; Mathe, Z; McNab, A; Meadows, B; Minard, M-N; Morandin, M; Morello, M J; Nasteva, I; Nikitin, N; Oggero, S; Okhrimenko, O; Palano, A; Palombo, F; Papanestis, A; Pazos Alvarez, A; Pepe Altarelli, M; Potterat, C; Pugatch, V; Raniuk, I; Ricciardi, S; Ruiz Valls, P; Sagidova, N; Sail, P; Savrina, D; Sciascia, B; Seco, M; Smith, M; Soler, F J P; Soomro, F; Sparkes, A; Stracka, S; Stroili, R; Subbiah, V K; Syropoulos, V; Tisserand, V; Tolk, S; Tsopelas, P; Vazquez Regueiro, P; Volyanskyy, D; Wiedner, D; Williams, M P; Wimberley, J; Witek, M; Wotton, S A; Wright, S; Zhokhov, A
Physical review letters, 06/2014, Letnik: 112, Številka: 22Journal Article
Resonant structures in B^{0}→ψ^{'}π^{-}K^{+} decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb^{-1} collected with the LHCb detector. The data cannot be described with K^{+}π^{-} resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)^{-}→ψ^{'}π^{-} component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)^{-} amplitude with the ψ^{'}π^{-} mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1^{+}.
