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    Observation of psi(4040) and psi(4160) decay into eta J/psi

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    Author
    Wang, XL; Han, YL; Yuan, CZ; Shen, CP; Wang, P; Adachi, I; Aihara, H; Asner, DM; Aulchenko, V; Aushev, T; ...
    Date
    2013-03-20
    Source Title
    PHYSICAL REVIEW D
    Publisher
    AMER PHYSICAL SOC
    University of Melbourne Author/s
    Sevior, Martin
    Affiliation
    Physics
    Metadata
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    Document Type
    Journal Article
    Citations
    Wang, X. L., Han, Y. L., Yuan, C. Z., Shen, C. P., Wang, P., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Aziz, T., Bakich, A. M., Ban, Y., Bhuyan, B., Bonvicini, G., Bozek, A., Bracko, M., Brodzicka, J., Brovchenko, O. ,... Zupanc, A. (2013). Observation of psi(4040) and psi(4160) decay into eta J/psi. PHYSICAL REVIEW D, 87 (5), https://doi.org/10.1103/PhysRevD.87.051101.
    Access Status
    This item is currently not available from this repository
    URI
    http://hdl.handle.net/11343/33108
    DOI
    10.1103/PhysRevD.87.051101
    Description

    C1 - Journal Articles Refereed

    Abstract
    The cross section for e^+e^- \to \eta J/\psi between \sqrt{s}=3.8 GeV/c^2 and 5.3 GeV/c^2 is measured via initial state radiation using 980 fb^{-1} of data on and around the \Upsilon(nS)(n=1,2,3,4,5) resonances collected with the Belle detector at KEKB. Two resonant structures at the \psi(4040) and \psi(4160) are observed in the \eta J/\psi invariant mass distribution. Fitting the mass spectrum with the coherent sum of two Breit-Wigner functions, one obtains BR(\psi(4040)\to\eta J/\psi)\cdot\Gamma_{ee}^{\psi(4040)} = (4.8\pm0.9\pm1.4) eV and BR(\psi(4160)\to\eta J/\psi)\cdot\Gamma_{ee}^{\psi(4160)} = (4.0\pm0.8\pm1.4) eV for one solution and BR(\psi(4040)\to\eta J/\psi)\cdot\Gamma_{ee}^{\psi(4040)} = (11.2\pm1.3\pm1.9) eV and BR(\psi(4160)\to\eta J/\psi)\cdot\Gamma_{ee}^{\psi(4160)} = (13.8\pm1.3\pm2.0) eV for the other solution, where the first errors are statistical and the second are systematic. This is the first measurement of this hadronic transition mode of these two states, and the partial widths to \eta J/\psi are found to be about 1 MeV. There is no evidence for the Y(4260), Y(4360), \psi(4415), or Y(4660) in the \eta J/\psi final state, and upper limits of their production rates in e^+e^- annihilation are determined.
    Keywords
    Particle Physics; Expanding Knowledge in the Physical Sciences

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