Regular Article - Theoretical Physics
The explanation of some exotic states in the tetraquark system
School of Physics, Southeast University, 210094, Nanjing, People’s Republic of China
2 Department of Physics, Nanjing Normal University, 210023, Nanjing, People’s Republic of China
3 Department of Physics, Yangzhou University, 225009, Yangzhou, People’s Republic of China
Accepted: 14 October 2021
Published online: 27 October 2021
Inspired by the recent observation of , X(4685) and X(4630) by the LHCb Collaboration and some exotic resonances such as X(4350), X(4500), etc. by several experiment collaborations, the tetraquark systems with , , and are systematically investigated in the framework of the quark delocalization color screening model(QDCSM). Two structures, the meson–meson and diquark–antidiquark structures, as well as the channel-coupling of all channels of these two configurations are considered in this work. The numerical results indicate that the molecular bound state with can be supposed to explain the . Besides, by using the stabilization method, several resonant states are obtained. Among these states, X(4350), X(4500) and X(4700) can be explained as the compact tetraquark states with , and the X(4274) is possible to be a candidate of the compact tetraquark state with . Apart from that, the resonance state with energy range 4028–4033 MeV, the two resonance states with energy range of 4394–4448 MeV and 4526–4536 MeV are possible to be new exotic states, which are indeed worthy of attention. More experimental tests are expected to check the existence of all these possible resonance states.
© The Author(s) 2021
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