Charmonium and exotics from Belle

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 $4.05\mathrm{GeV}/c^2$ 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 $B\to K\pi +X(\to {\pi }^{+}{\pi }^{-}J/\psi )$.

To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22 May 2015

References in corpus (1)

• QCD and strongly coupled gauge theories: challenges and perspectives