Abstract
The tetraquark states with diquark--anti-diquark configuration have been studied in the flux-tube model, in which the multibody confinement is used. In this model approach, the states $Y(2175)$, ${f}_{0}(600)$, ${f}_{0}(980)$, and $X(1576)$ can be assigned as tetraquark states. They are color confinement resonances with three-dimension structure. This study suggests that the multibody confinement should be employed in the quark model study of multiquark states instead of the additive two-body confinement.
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