On the structures of new scalar resonances $T_{cs0}^a(2900{)}^{++}$ and $T_{cs0}^a(2900{)}^0$

Abstract

We investigate properties of the new scalar resonances $T_{cs0}^a(2900{)}^{++}$ and $T_{cs0}^a(2900{)}^0$, which were recently reported by the LHCb collaboration. These states were observed as resonant structures in $D_s^{+}{\pi }^{+}$ and $D_s^{+}{\pi }^{-}$ invariant mass distributions in $B^{+}$ meson decays. We argue that $T_{cs0}^a(2900{)}^{++}$ and $T_{cs0}^a(2900{)}^0$ may be modeled as molecules ${\mathcal{M}}^{++}=D_s^{\ast +}{\rho }^{+}$ and ${\mathcal{M}}^0=D_s^{\ast +}{\rho }^{-}$ of conventional vector mesons, respectively. The mass $m$ and current coupling $f$ of the molecule ${\mathcal{M}}^{++}$ are calculated using two-point sum rule method. The sum rule analysis is performed by taking into account vacuum condensates up to dimension $8$. The obtained result for the mass, $m=(2917\pm 135)\mathrm{MeV}$, permits us to consider the molecule ${\mathcal{M}}^{++}$ as one of possible models of the resonance $T_{cs0}^a(2900{)}^{++}$. Because the second structure $T_{cs0}^a(2900{)}^0$ is isospin partner of the doubly charged state, it should have the mass close to $m$.

7 Pages and 3 Figures

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Cited by in corpus (8)

• 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 $D^{\ast +}{K}^{\ast +}$
• Analysis of the $T_{c\bar{s}}(2900)$ and related tetraquark states with the QCD sum rules
• The roles of the $T_{c\bar{s}0}(2900{)}^0$ and $D_0^{\ast }(2300)$ in the process $B^{-}\to D_s^{+}{K}^{-}{\pi }^{-}$
• Possible open charm molecular pentaquarks from ${\Lambda }_c{K}^{(\ast )}/{\Sigma }_c{K}^{(\ast )}$ interactions
• 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