Explanation of the newly obseaved $Z_{cs}^{-}(3985)$ as a $D_s^{(\ast )-}{D}^{(\ast )0}$ molecular state

Abstract

Inspired by the newly observed $Z_{cs}^{-}(3985)$ by BESIII collaboration, we study the structure of this particle in the picture of $D_s^{(\ast )-}{D}^{(\ast )0}$ molecular state. Firstly we systematically construct the Lagrangians which describing the interaction of charmed mesons, taking into account the chiral and hidden local symmetries. With the obtained effective potentials from the Lagrangians constructed, we solve the coupled channel Bethe-Salpeter equation with the on-shell approximation. On the third Reimann sheet, a pole position of around $3982.34-i0.53$ MeV is obtained, which can be associated to the $Z_{cs}^{-}(3985)$ and explained as a loose bound state of $D_s^{\ast }{\bar{D}}^{\ast }$.

6 pages, 1 figure

Cited by in corpus (14)

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• Hadronic molecules in B decays
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• A combined analysis of the $Z_c(3900)$ and the $Z_{cs}(3985)$ exotic states
• A unified description of the hidden-charm tetraquark states $Z_{cs}(3985)$, $Z_c(3900)$ and $X(4020)$
• Hidden and doubly heavy molecular states from interactions $D_{(s)}^{(\ast )}{\bar{D}}_s^{(\ast )}$/$B_{(s)}^{(\ast )}{\bar{B}}_s^{(\ast )}$ and $D_{(s)}^{(\ast )}{D}_s^{(\ast )}$/$B_{(s)}^{(\ast )}{B}_s^{(\ast )}$
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• Strange hidden-charm tetraquarks in constituent quark models
• Threshold effects as the origin of $Z_{cs}(4000)$, $Z_{cs}(4220)$ and $X(4700)$ observed in $B^{+}\to J/\psi \varphi K^{+}$
• $Z_{cs}$ states from the $D_s^{\ast }{\bar{D}}^{\ast }$ and $J/\psi K^{\ast }$ coupled channels: Signal in $B^{+}\to J/\psi \varphi K^{+}$ decay
• The decay widths of the $Z_{cs}(3985/4000)$ based on rigorous quark-hadron duality
• Hadronic medium effects on $Z_{cs}(3985{)}^{-}$ production in heavy-ion collisions