The $T_{c\bar{s}}(2900)$ as a threshold effect from the interaction of the $D^{\ast }{K}^{\ast }$, $D_s^{\ast }\rho$ channels

Abstract

We look at the mass distribution of the $D_s^{+}{\pi }^{-}$ in the $B^0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay, where a peak has been observed in the region of the $D_s^{\ast }\rho$, $D^{\ast }{K}^{\ast }$ thresholds. By creating these two channels together with a ${\bar{D}}^0$ in $B^0$ decay and letting them interact as coupled channels, we obtain a structure around their thresholds, short of producing a bound state, which leads to a peak in the $D_s^{+}{\pi }^{-}$ mass distribution in the $B^0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay. We conclude that the interaction between the $D^{\ast }{K}^{\ast }$ and $D_s^{\ast }\rho$ is essential to produce the cusp structure that we associate to the recently seen $T_{c\bar{s}}(2900)$, and that its experimental width is mainly due to the decay width of the $\rho$ meson. The peak obtained together with a smooth background reproduces fairly well the experimental mass distribution observed in the $B_0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay.

5 pages, 8 figures, 1 table

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Cited by in corpus (11)

• Strong decays of $T_{c\bar{s}0}(2900{)}^{++/0}$ as a fully open-flavor tetraquark state
• Charmed-strange tetraquarks and their decays in a potential quark model
• Modeling the resonance $T_{cs0}^a(2900{)}^{++}$ as a hadronic molecule $D^{\ast +}{K}^{\ast +}$
• Spectrum of the molecular tetraquarks: Unraveling the $T_{cs0}(2900)$ and $T_{c\bar{s}0}^a(2900)$
• Analysis of the $T_{c\bar{s}}(2900)$ and related tetraquark states with the QCD sum rules
• Exotic Hadrons at LHCb
• The roles of the $T_{c\bar{s}0}(2900{)}^0$ and $D_0^{\ast }(2300)$ in the process $B^{-}\to D_s^{+}{K}^{-}{\pi }^{-}$
• Classification of Coupled-Channel Near-Threshold Structures
• Theoretical study of the open-flavor tetraquark $T_{c\bar{s}}(2900)$ in the process ${\bar{B}}_s^0\to K^0{D}^0{\pi }^0$
• Pole analysis for the $D^{\ast }\bar{K}$-$D\overline{K^{\ast }}$ coupled-channel system
• Exotic hadrons associated with $b$-quark