Speaker
Description
Lots of charmonium-like structures have been observed. Most of them share the same quantum numbers with conventional charmonium states, with exceptions of those with an electric charge and/or strangeness. We show that a neutral and zero-strangeness charmonium-like exotic state with quantum numbers $J^{PC}=0^{--}$, denoted as $\psi_0(4360)$, is a robust prediction in the hadronic molecular scenario, where the $\psi(4230),\psi(4360)$ and $\psi(4415)$ are identified as $D\bar D_1,D^*\bar D_1$ and $D^*\bar D^*_2$ bound states, respectively; the mass and width are predicted to be $(4366\pm18)$~MeV and less than 10~MeV, espectively. The interactions are calculated by the $t$-channel vector and pseudoscalar meson exchanges assisted by heavy quark spin symmetry. The coupled-channel effects and the $u$-channel pion exchange including full 3-body effects of the $D^*\bar D^*\pi$ intermediate states are carefully examined. The $\psi_0(4360)$ is significant in two folds: no $0^{--}$ hadron has been observed so far, and a study of this state will enlighten the understanding of the mysterious vector mesons between 4.2 and 4.5~GeV. We propose that such an exotic state can be searched for in $e^+e^-\to \eta \psi_0(4360)$ and uniquely identified by measuring the angular distribution of the outgoing $\eta$ meson.
| Category | poster |
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