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

2016

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

Chen, Xiaoyun, Ping, Jialun

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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.

Built on

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A. Valcarce, H. Garcilazo, F. Fernandez, and P. Gonzalez, Rep. Prog. Phys. 68
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Then

The LHCb Collaboration [LHCb Collaboration], LHCbCONF-2016-004, CERN-LHCb-CONF-2016-004
2016
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