https://doi.org/10.1140/epjc/s10052-019-7065-0
Regular Article - Theoretical Physics
Investigating tetraquarks composed of 
and 
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
* e-mail: jlping@njnu.edu.cn
Received:
17
February
2019
Accepted:
22
June
2019
Published online:
2
July
2019
In the framework of the quark delocalization color screening model, we investigate tetraquarks composed of and in two structures: meson-meson structure and diquark–antidiquark structure. Neither bound state nor resonance state is found in the system composed of . The reported X(5568) cannot be explained as a molecular state or a diquark–antidiquark resonance of in present calculation. However, two bound states of the diquark–antidiquark structure are obtained in the tetraquarks system composed of : an 
state with the mass of 5701 MeV, and an 
state with the mass of 5756 MeV, which maybe the better tetraquark states with four different flavors. Our results indicate that the diquark–antidiquark configuration would be a good choice for the tetraquarks with quantum numbers and . The tetraquarks composed of is more possible to form bound states than the one composed of . These bound states are worth investigating in future experiments.
© The Author(s), 2019
