Interference effect as resonance killer of newly observed charmoniumlike states $Y(4320)$ and $Y(4390)$

Abstract

In this letter, we decode the newly observed charmoniumlike states, $Y(4320)$ and $Y(4390)$, by introducing interference effect between $\psi (4160)$ and $\psi (4415)$, which plays a role of resonance killer for $Y(4320)$ and $Y(4390)$. It means that two newly reported charmoniumlike states are not genuine resonances, according to which we can naturally explain why two well-established charmonia $\psi (4160)$ and $\psi (4415)$ are missing in the cross sections of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and ${\pi }^{+}{\pi }^{-}{h}_c$ simultaneously. To well describe the detailed data of these cross sections around $\sqrt{s}=4.2$ GeV, our study further illustrates that a charmoniumlike structure $Y(4220)$ must be introduced. As a charmonium, $Y(4220)$ should dominantly decay into its open-charm channel $e^{+}{e}^{-}\to D^0{\pi }^{+}{D}^{\ast -}$, which provides an extra support to $\psi (4S)$ assignment to $Y(4220)$. In fact, this interference effect introduced to explain $Y(4320)$ and $Y(4390)$ gives a typical example of non-resonant explanations to the observed $XYZ$ states, which should be paid more attention especially before identifying the observed $XYZ$ states as genuine resonances.

5 pages, 4 figures

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Cited by in corpus (22)

• The $XYZ$ states: experimental and theoretical status and perspectives
• Pentaquark and Tetraquark states
• Constructing $J/\psi$ family with updated data of charmoniumlike $Y$ states
• Strong decays of higher charmonium states into open-charm meson pairs
• Are the $Y$ states around 4.6 GeV from $e^{+}{e}^{-}$ annihilation higher charmonia?
• Correlation of the hidden-charm molecular tetraquarks and the charmoniumlike structures existing in the $B\to XYZ+K$
• Nature of the $Y(4260)$: A light-quark perspective
• Prediction of an exotic state around 4240 MeV with $J^{PC}=1^{-+}$ as C-parity partner of Y(4260) in molecular picture
• Confirming the existence of a new higher charmonium $\psi (4500)$ by the newly released data of $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$
• Global coupled-channel analysis of $e^{+}{e}^{-}\to c\bar{c}$ processes in $\sqrt{s}=3.75-4.7$ GeV
• Connection between near the $D_s^{+}{D}_s^{-}$ threshold enhancement in $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ and conventional charmonium ${\chi }_{c0}(2P)$
• Reconciling the X(2240) with the Y(2175)
• Are the XYZ states unconventional states or conventional states with unconventional properties?
• On leptonic width of $X(4260)$
• How higher charmonia shape the puzzling data of the $e^{+}{e}^{-}\to \eta J/\psi$ cross section
• Reevaluating the $\psi (4160)$ Resonance Parameter Using $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$ Data in the Context of Unquenched Charmonium Spectroscopy
• Observation of Three Resonant Structures in the Cross Section of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{h}_c$
• Discovery potential of charmonium $2P$ states through the $e^{+}{e}^{-}\to \gamma D\bar{D}$ processes
• $D$ wave charmonia
• Prospects for observing the missing $2D$ and $1F$ charmonium states around 4 GeV
• Search for $e^{+}{e}^{-}\to K_S^0{K}_S^0{h}_c$
• The $Y(4260)$ and $Y(4360)$ enhancements within coupled-channels