Abstract
The light scalar mesons below 1 GeV configured as tetraquark systems are studied in the framework of the flux-tube model. Comparative studies indicate that a multi-body confinement, instead of the additive two-body confinement, should be used in a multiquark system. The σ and κ mesons could be well accommodated in the diquark-antidiquark tetraquark picture, and could be colour-confinement resonances. The a0(980) and f0(980) mesons are not described as KK̄ molecular states and nsn̄s̄ diquark-antidiquark states. However, the mass of the first radial excited state of the diquark-antidiquark state, nnn̄n̄ is 1019 MeV, is close to the experimental data of the f0(980).
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