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Abstract
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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Details
1 Southwest University, School of Physical Science and Technology, Chongqing, China (GRID:grid.263906.8) (ISNI:0000 0001 0362 4044)
2 Qufu Normal University, College of Physics and Engineering, Qufu, China (GRID:grid.412638.a) (ISNI:0000 0001 0227 8151)
3 Chinese Academy of Sciences, Institute of Modern Physics, Lanzhou, China (GRID:grid.9227.e) (ISNI:0000000119573309); University of Chinese Academy of Sciences, School of Nuclear Science and Technology, Beijing, China (GRID:grid.410726.6) (ISNI:0000 0004 1797 8419); Zhengzhou University, School of Physics and Microelectronics, Zhengzhou, China (GRID:grid.207374.5) (ISNI:0000 0001 2189 3846); Lanzhou University, Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou, China (GRID:grid.32566.34) (ISNI:0000 0000 8571 0482)