Exotic ${\bar{D}}_s^{(\ast )}{D}^{(\ast )}$ molecular states and $sc\bar{q}\bar{c}$ tetraquark states with $J^P=0^{+},1^{+},2^{+}$

Abstract

We have calculated the mass spectra for the ${\bar{D}}_s^{(\ast )}{D}^{(\ast )}$ molecular states and $sc\bar{q}\bar{c}$ tetraquark states with $J^P=0^{+},1^{+},2^{+}$. The masses of the axial-vector ${\bar{D}}_s{D}^{\ast }$, ${\bar{D}}_s^{\ast }D$ molecular states and $1_{[sc]}\oplus 0_{[\bar{q}\bar{c}]}$, $0_{[sc]}\oplus 1_{[\bar{q}\bar{c}]}$ tetraquark states are predicted to be around 3.98 GeV, which are in good agreement with the mass of $Z_{cs}(3985{)}^{-}$ from BESIII \cite{besiii2020Zcs}. In both the molecular and diquark-antidiquark pictures, our results suggest that there may exist two almost degenerate states, as the strange partners of the $X(3872)$ and $Z_c(3900)$. We propose to carefully examine the $Z_{cs}(3985)$ in future experiments to verify this. One may also search for more hidden-charm four-quark states with strangeness not only in the open-charm ${\bar{D}}_s^{(\ast )}{D}^{(\ast )}$ channels, but also in the hidden-charm channels ${\eta }_{c}K/K^{\ast }$, $J/\psi K/K^{\ast }$.

19 pages, 3 figures. Accepted by Chinese Physics C

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Cited by in corpus (21)

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• Hadronic molecules in B decays
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• ${\bar{D}}_s^{(\ast )}{D}^{(\ast )}$ molecular state with $J^P=1^{+}$
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• Modeling the resonance $T_{cs0}^a(2900{)}^{++}$ as a hadronic molecule $D^{\ast +}{K}^{\ast +}$
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• $Z_{cs}(3985)$ in next-to-leading-order chiral effective field theory -- the first truncation uncertainty analysis
• $X$ and $Z_{cs}$ in $B^{+}\to J/\psi \varphi K^{+}$ as $s$-wave threshold cusps and alternative spin-parity assignments to $X(4274)$ and $X(4500)$
• Search for hidden-charm tetraquark with strangeness in $e^{+}{e}^{-}\to K^{+}{D}_s^{\ast -}{D}^{\ast 0}+c.c.$
• Possible Molecular Explanation for the Resonance $Y(4500)$
• Spin and polarization analysis of $Z_{cs}$ state
• Mixing angles between the tetraquark states with two heavy quarks within QCD sum rules