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  • Study of e+ e- → π+ π- J/ψ ...
    Aihara, H; Asner, D M; Aulchenko, V; Bala, A; Belous, K; Bhardwaj, V; Bischofberger, M; Bračko, M; Browder, T E; Chekelian, V; Chen, P; Cheon, B G; Cho, K; Choi, Y; Cinabro, D; Dalseno, J; Danilov, M; Doležal, Z; Drutskoy, A; Farhat, H; Fast, J E; Feindt, M; Ferber, T; Gabyshev, N; Goh, Y M; Golob, B; Haba, J; Hou, W-S; Hsiung, Y B; Hyun, H J; Inami, K; Ishikawa, A; Itoh, R; Iwasaki, Y; Joffe, D; Julius, T; Kim, J B; Klucar, J; Ko, B R; Kodyš, P; Korpar, S; Krokovny, P; Kuhr, T; Lange, J S; Lee, S-H; Li, J; Liu, C; Lukin, P; Matvienko, D; Miyabayashi, K; Mizuk, R; Mohanty, G B; Moll, A; Natkaniec, Z; Nayak, M; Nisar, N K; Nishida, S; Olsen, S L; Oswald, C; Park, H K; Pestotnik, R; Petrič, M; Piilonen, L E; Röhrken, M; Sahoo, H; Saito, T; Santel, D; Sanuki, T; Savinov, V; Schnell, G; Schwanda, C; Seon, O; Sevior, M E; Shapkin, M; Sibidanov, A; Sohn, Y-S; Sokolov, A; Solovieva, E; Starič, M; Steder, M; Sumihama, M; Tamponi, U; Tanida, K; Tatishvili, G; Trabelsi, K; Tsuboyama, T; Unno, Y; Uno, S; Van Hulse, C; Varner, G; Varvell, K E; Wagner, M N; Wang, P; Watanabe, M; Won, E; Yamashita, Y; Yashchenko, S; Yusa, Y; Zhang, Z P; Zhilich, V

    Physical review letters, 2013-Jun-21, Letnik: 110, Številka: 25
    Journal Article

    The cross section for ee+ e- → π+ π- J/ψ between 3.8 and 5.5 GeV is measured with a 967  fb(-1) data sample collected by the Belle detector at or near the Υ(nS) (n = 1,2,…,5) resonances. The Y(4260) state is observed, and its resonance parameters are determined. In addition, an excess of π+ π- J/ψ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the Y(4008) state that was previously reported by Belle. In a study of Y(4260) → π+ π- J/ψ decays, a structure is observed in the M(π(±)J/ψ) mass spectrum with 5.2σ significance, with mass M = (3894.5 ± 6.6 ± 4.5)  MeV/c2 and width Γ = (63 ± 24 ± 26)  MeV/c2, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.