Charmonium and exotics from Belle

preprint2015arXivOpen access

Abstract

The recent results on charmonium and charmoniumlike states from Belle experiment are reviewed. We summarise searches in BB decays for possible XX-like states in final states containing ηcη_c. The new measurement of e+e−→π+π−ψ(2S)e^+e^-\toπ^+π^-ψ(2S) improves the determination of the properties of Y(4360)Y(4360) and Y(4660)Y(4660). The fits including Y(4260)Y(4260) are performed. Evidence for a charged charmoniumlike structure at 4.05 GeV/c24.05~{\rm GeV}/c^2 is observed in the π±ψ(2S)π^{\pm}ψ(2S) intermediate state in the Y(4360)Y(4360) decays. Belle also updates the measurement on e+e−→KKJ/ψe^+e^-\to KKJ/ψ via initial state radiation using the full data sample. Finally, Belle observed X(3872)X(3872) in B→Kπ+X(→π+π−J/ψ)B\to Kπ+ X(\toπ^+π^-J/ψ).

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