Regular Article - Theoretical Physics
The low-lying hidden- and double-charm tetraquark states in a constituent quark model with instanton-induced interaction
School of Physical Science and Technology, Southwest University, 400715, Chongqing, China
2 College of Physics and Engineering, Qufu Normal University, 273165, Qufu, China
3 Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
4 School of Nuclear Science and Technology, University of Chinese Academy of Sciences, 101408, Beijing, China
5 School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, Henan, China
6 Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou University, 730000, Lanzhou, China
Accepted: 3 August 2022
Published online: 18 August 2022
Spectrum of the low-lying hidden- and double-charm tetraquark states are investigated in a nonrelativistic quark potential model, where the instanton-induced interaction is taken as the residual spin-dependent hyperfine interaction between quarks. The model parameters are fixed by fitting the spectrum of the ground hadron states. Our numerical results show that masses of several presently studied tetraquark states are close to those of the experimentally observed candidates of exotic meson, which indicates that the corresponding compact tetraquark components may take considerable probabilities in those observed exotic states.
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