Possibility of $T_{c\bar{s}}(2900)$ as the resonance-like structure induced by threshold effects

Abstract

We investigate the process $B\to \bar{D}{D}_s\pi$ via several rescattering processes. It is shown that the triangle singularity (TS) peak around the $D^{\ast }{K}^{\ast }$ threshold generated from the ${\chi }_{c1}{K}^{\ast }{D}^{\ast }$ loop is relatively narrow, which may simulate the resonance-like structure $T_{c\bar{s}}(2900)$ recently observed by LHCb in the $D_s\pi$ spectrum. However, the TS peak around the $D_s^{\ast }\rho$ threshold generated from the $D^{\ast \ast }{D}_s^{\ast }\rho$ loop is smoothed by the broad width of $\rho$, which itself can hardly describe the $T_{c\bar{s}}(2900)$ structure. A TS signal around the $DK$ threshold generated from the ${\chi }_{c0}KD$ loop is also predicted.

arXiv comment8 pages, 6 figures

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• Possible molecular states of ${\bar{D}}^{\ast }{K}^{\ast }$ ($D^{\ast }{K}^{\ast }$) and the new exotic states $X_0(2900)$ and $X_1(2900)$ ($T_{cs0}^a(2900{)}^0$ and $T_{cs0}^a(2900{)}^{++}$)
• Modeling the resonance $T_{cs0}^a(2900{)}^{++}$ as a hadronic molecule $D^{\ast +}{K}^{\ast +}$
• Color flux-tube nature of the states $T_{cs}(2900)$ and $T_{c\bar{s}}^a(2900)$
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• Theoretical study of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ in the process ${\bar{B}}_s^0\to K^0{D}^0{\pi }^0$
• Finding a clean process $B^{-}\to K^{-}{D}^0{K}^0$ to probe absolutely exotic four-quark states
• Exotic hadrons associated with $b$-quark