Prediction of an exotic state around 4240 MeV with $J^{PC}=1^{-+}$ as C-parity partner of Y(4260) in molecular picture

Abstract

The possibility of the Y(4260) being the molecular state of $D{\bar{D}}_1(2420)+c.c.$ is investigated in the one boson exchange model. It turns out that the potential of $J^{PC}=1^{--}$ state formed by $D{\bar{D}}_1(2420)+c.c.$ is attractive and strong enough to bind them together when the momentum cutoff $\Lambda \gtrsim 1.4$ GeV. To produce the Y(4260) with correct binding energy, we need $\Lambda \approx 2.1$ GeV. Besides, $D{\bar{D}}_1(2420)+c.c.$ can also form a state with exotic quantum numbers, $J^{PC}=1^{-+}$, and its potential similar with that of the $J^{PC}=1^{--}$ state. Therefore, an exotic state with mass around 4240 MeV (called ${\eta }_{c1}(4240)$) is predicted to exist. Our estimation of the mass of the $J^{PC}=1^{-+}$ state in charmonium region is in agreement with those predicted by the chiral quark model and the lattice QCD. The possible decay modes and their relative widths are estimated and the results suggest that this exotic state can be searched for in $\eta {\eta }_c$ and $\eta {\chi }_{c1}$ channels.

11 pages, 5 figures, some errors corrected

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• Molecular picture for $X_0(2900)$ and $X_1(2900)$
• Hidden-charm pentaquarks with triple strangeness due to the ${\Omega }_c^{(\ast )}{\bar{D}}_s^{(\ast )}$ interactions
• Exotic double-charm molecular states with hidden or open strangeness and around $4.5\sim 4.7$ GeV
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• Prediction of a narrow exotic hadronic state with quantum numbers $J^{PC}=0^{--}$
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• Prediction of possible $D{K}_1$ bound states
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• $Y(4626)$ as a $P$-wave $[cs][\bar{c}\bar{s}]$ tetraquark state
• Production of $1^{-+}$ exotic charmonium-like states in electron-positron collisions
• Possible ${\Sigma }_c^{\ast }\bar{\Sigma }$ molecular states
• Looking for a vector charmonium-like state $Y$ in $e^{+}{e}^{-}\to \bar{D}{D}_1(2420)+c.c.$