Exotic states in the chiral quark model
Yuheng Wu (Department of Physics, Yancheng Institute of Technology, Yancheng 224000, P. R. China); Ye Yan (Department of Physics, Nanjing Normal University, Nanjing, Jiangsu 210097, P. R. China); Yue Tan (Department of Physics, Yancheng Institute of Technology, Yancheng 224000, P. R. China); Hongxia Huang (Department of Physics, Nanjing Normal University, Nanjing, Jiangsu 210097, P. R. China); Jialun Ping (Department of Physics, Nanjing Normal University, Nanjing, Jiangsu 210097, P. R. China); et al - Show all 6 authors
In the framework of the chiral quark model, we investigate the (, and , ) tetraquark system with two structures: and . The bound-state calculation shows that for the single channel, there is no evidence for any bound state below the minimum threshold in both and systems. However, after coupling all channels of two structures, we obtain a bound state below the minimum threshold in the system with the energy of 1998 MeV, and the quantum number is . Meanwhile, in the system, two bound states with energies of 5414 MeV and 5456 MeV are obtained, and the quantum numbers are and , respectively. Besides, we also employ the real-scaling method to search for resonance states in the and systems. Unfortunately, no genuine resonance states were obtained in both systems. We suggest future experiments to search for these three possible bound states.