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Charmonium and exotics from Belle

Published 14 Sep 2015 in hep-ex | (1509.04156v1)

Abstract: The recent results on charmonium and charmoniumlike states from Belle experiment are reviewed. We summarise searches in $B$ decays for possible $X$-like states in final states containing $\eta_c$. The new measurement of $e+e-\to\pi+\pi-\psi(2S)$ improves the determination of the properties of $Y(4360)$ and $Y(4660)$. The fits including $Y(4260)$ are performed. Evidence for a charged charmoniumlike structure at $4.05~{\rm GeV}/c2$ is observed in the $\pi{\pm}\psi(2S)$ intermediate state in the $Y(4360)$ decays. Belle also updates the measurement on $e+e-\to KKJ/\psi$ via initial state radiation using the full data sample. Finally, Belle observed $X(3872)$ in $B\to K\pi + X(\to\pi+\pi-J/\psi)$.

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