The low-lying hidden- and double-charm tetraquark states in a constituent quark model with instanton-induced interaction

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.

Automated summary

In this study, the spectrum of low-lying hidden- and double-charm tetraquark states is investigated using a nonrelativistic quark potential model. The instanton-induced interaction is considered as the residual spin-dependent hyperfine interaction between quarks. The numerical results show that the masses of several tetraquark states studied are close to those of experimentally observed candidates of exotic meson, suggesting the presence of corresponding compact tetraquark components in those observed states.