On lower scalar quark-antiquark nonets

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Two-and three-channel analyses of experimental data on the coupled processes ππ → ππ, KK, ηη in the channel with IGJPC = 0+0++ are carried out and discussed. In a model-independent approach, confirmation of the σ-meson below 1GeV and definite indications of the QCD nature of other f0 resonances are obtained. An assignment of the scalar mesons below 1.9 GeV to lower nonets is proposed.

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