Regular Article - Theoretical Physics
Is the exotic X(5568) a bound state?
Department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems, Nanjing Normal University, Nanjing, 210023, People’s Republic of China
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Accepted: 14 June 2016
Published online: 24 June 2016
Stimulated by the recent observation of the exotic X(5568) state by the D0 Collaboration, we study the four-quark system with quantum numbers in the framework of the chiral quark model. Two structures, diquark–antidiquark and meson–meson, with all possible color configurations are investigated by using the Gaussian expansion method. The results show that the energies of the tetraquark states with diquark–antiquark structure are too high to be candidates of X(5568), and no molecular structure can be formed in our calculations. The calculation is also extended to the four-quark system and the same results as that of are obtained.
© The Author(s), 2016