Investigating tetraquarks composed of $us\bar{d}\bar{b}$ and $ud\bar{s}\bar{b}$

Abstract

In the framework of the quark delocalization color screening model, we investigate tetraquarks composed of $us\bar{d}\bar{b}$ and $ud\bar{s}\bar{b}$ in two structures: meson-meson structure and diquark-antidiquark structure. Neither bound state nor resonance state is found in the system composed of $us\bar{d}\bar{b}$. The reported $X(5568)$ cannot be explained as a molecular state or a diquark-antidiquark resonance of $us\bar{d}\bar{b}$ in present calculation. However, two bound states of the diquark-antidiquark structure are obtained in the tetraquarks system composed of $ud\bar{s}\bar{b}$: an $IJ=00$ state with the mass of $5701$ MeV, and an $IJ=01$ state with the mass of $5756$ MeV, which maybe the partners of $X(5568)$ states. Our results indicate that the diquark-antidiquark configuration would be a good choice for the tetraquarks $ud\bar{s}\bar{b}$ with quantum numbers $IJ=00$ and $IJ=01$. The tetraquarks composed of $ud\bar{s}\bar{b}$ is more possible to form bound states than the one composed of $us\bar{d}\bar{b}$. These bound states are worth investigating in future experiments.

8 pages, 2 figures

References in corpus (5)

• A New Picture for the Formation and Decay of the Exotic $XYZ$ Mesons
• A Theory of X and Z Multiquark Resonances
• $P_c$-like pentaquarks in hidden strange sector
• searches for ud\bar{s}\bar{b} in the chiral quark model
• Estimating decay rate of $X^{\pm }(5568)\to B_s{\pi }^{\pm }$ while assuming them to be molecular states

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• $QQ\bar{q}\bar{q}$ in a chiral constituent quark model
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• Spectrum and rearrangement decays of tetraquark states with four different flavors
• Branching fractions of $B^{-}\to D^{-}{X}_{0,1}(2900)$ and their implications
• Tetraquarks with open charm favor
• X(2900) in a chiral quark model
• $bb\bar{u}\bar{d}$ and $bs\bar{u}\bar{d}$ tetraquarks from lattice QCD using two-meson and diquark-antidiquark variational basis
• Weak-decay searches for $Qs\bar{u}\bar{d}$ tetraquarks