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Adeva, B; Adrover, C; Archilli, F; Artamonov, A; Belyaev, I; Bettler, M-O; Blanc, F; Bondar, A; Bressieux, J; Brook, N H; Buytaert, J; Cardini, A; Ciba, K; Cid Vidal, X; Cogan, J; Coquereau, S; David, P N Y; Derkach, D; Deschamps, O; Dettori, F; Dogaru, M; Dziurda, A; Dzyuba, A; Eitschberger, U; Farinelli, C; Farry, S; Ferguson, D; Fitzpatrick, C; Forty, R; Francisco, O; Frei, C; Gaspar, C; Göbel, C; Gorbounov, P; Granado Cardoso, L A; Grecu, A; Griffith, P; Gushchin, E; Harnew, S T; Harrison, J; Hopchev, P; Idzik, M; Karacson, M; Kvaratskheliya, T; Lanciotti, E; Lazzeroni, C; Leflat, A; Li Gioi, L; Lopes, J H; Malde, S; Manca, G; Marks, J; Martins Tostes, D; Matev, R; Mous, I; Needham, M; Nguyen, A D; Nicol, M; Niet, R; Otalora Goicochea, J M; Palutan, M; Pappagallo, M; Patel, M; Patrignani, C; Picatoste Olloqui, E; Poluektov, A; Pritchard, A; Pugatch, V; Qian, W; Rauschmayr, N; Raven, G; Reid, M M; Roa Romero, D A; Rodrigues, E; Rodriguez Perez, P; Rouvinet, J; Ruffini, F; Ruiz Valls, P; Savrina, D; Schwemmer, R; Senderowska, K; Shcheglov, Y; Smith, E; Sokoloff, M D; Soler, F J P; Stahl, S; Stevenson, S; Stoica, S; Sun, L; Tresch, M; Uwer, U; Vallier, A; Velthuis, J J; Voss, H; Waldi, R; Watson, N K; Whitehead, M; Williams, M P; Wyllie, K; Zangoli, M
Physical review letters, 09/2013, Letnik: 111, Številka: 11Journal Article
A broad peaking structure is observed in the dimuon spectrum of B+ → K+ μ+ μ- decays in the kinematic region where the kaon has a low recoil against the dimuon system. The structure is consistent with interference between the B+ → K+ μ+ μ- decay and a resonance and has a statistical significance exceeding six standard deviations. The mean and width of the resonance are measured to be 4191(-8)(+9) MeV/c2 and 65(-16)(+22) MeV/c2, respectively, where the uncertainties include statistical and systematic contributions. These measurements are compatible with the properties of the ψ(4160) meson. First observations of both the decay B+ → ψ(4160)K+ and the subsequent decay ψ(4160) → μ+ μ- are reported. The resonant decay and the interference contribution make up 20% of the yield for dimuon masses above 3770 MeV/c2. This contribution is larger than theoretical estimates.
