Is the exotic $X(5568)$ a bound state?

Abstract

Stimulated by the recent observation of the exotic $X(5568)$ state by D0 Collaboration, we study the four-quark system $us\bar{b}\bar{d}$ with quantum numbers $J^P=0^{+}$ in the framework of chiral quark model. Two structures, diquark-antidiquark and meson-meson, with all possible color configurations are investigated by using Gaussian expansion method. The results show that energies of the tetraquark states with diquark-antiquark structure are too high to the candidate of $X(5568)$, and no molecular structure can be formed in our calculations. The calculation is also extended to the four-quark system $us\bar{c}\bar{d}$ and the same results as that of $us\bar{b}\bar{d}$ are obtained.

5 pages, 1 figure

References in corpus (6)

• Prediction of narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm above 4 GeV
• Quark-model study of few-baryon systems
• $\Lambda NN$ and $\Sigma NN$ systems at threshold
• $X(5568)$ and and its partner states
• Can $X(5568)$ be described as a $B_s\pi$, $B\bar{K}$ resonant state?
• Could the observation of $X(5568)$ be resulted by the near threshold rescattering effects?

Cited by in corpus (27)

• The $XYZ$ states: experimental and theoretical status and perspectives
• A review of the open charm and open bottom systems
• Exotic Hadrons from Heavy Ion Collisions
• Heavy-flavored tetraquark states with the $QQ\bar{Q}\bar{Q}$ configuration
• $QQ\bar{q}\bar{q}$ in a chiral constituent quark model
• Open charm and bottom tetraquarks in an extended relativized quark model
• Spectrum and rearrangement decays of tetraquark states with four different flavors
• Triply heavy tetraquark states with the $QQ\bar{Q}\bar{q}$ configuration
• Open-flavor charmed/bottom $sq\bar{q}\bar{Q}$ and $qq\bar{q}\bar{Q}$ tetraquark states
• $B_s{\pi }^{+}$ scattering and search for X(5568) with lattice QCD
• Doubly heavy tetraquark states $cc\bar{u}\bar{d}$ and $bb\bar{u}\bar{d}$
• Where does the X(5568) structure come from?
• The decays of the fully open flavor state $T_{c\bar{s}0}^0$ in a $D^{\ast }{K}^{\ast }$ molecule scenario
• $B_s\pi$--$B\bar{K}$ interactions in finite volume and the $X(5568)$
• X(2900) in a chiral quark model
• Production of Charmed Tetraquarks from $B_c$ and $B$ decays
• searches for ud\bar{s}\bar{b} in the chiral quark model
• Study on $Z_{cs}$ and excited $B_s^0$ states in the chiral quark model
• Investigating tetraquarks composed of $us\bar{d}\bar{b}$ and $ud\bar{s}\bar{b}$
• $Y(4626)$ in a chiral constituent quark model
• Study of X(5568) in a unitary coupled-channel approximation of $B\bar{K}$ and $B_s\pi$
• The bottomed strange molecules with isospin 0
• How can $X^{\pm }(5568)$ escape detection?
• Mass Spectrum of Exotic X(5568) State via Artificial Neural Network
• Investigating $S$-wave bound states composed of two pseudoscalar mesons
• The possible $B\pi$ molecular state and its radiative decay
• X, Y and Z States