It is shown that in spite of their unconventional experimental properties the scalar mesons ε, δ, κ, and S* can be understood as the unitarized remnants of conventional qq̄ states. The S* and δ have large components of qq̄qq̄ in the form of virtual two-meson states (mainly KK̄).
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Nils A. Törnqvist (1982) studied this question.
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