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Properties of the light scalar mesons face the experimental data on the $ϕ\toπ^0π^0γ$ decay and the $ππ$ scattering

N. N Achasov·A. V. Kiselev
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Abstract

The high-statistical KLOE data on the $ϕ\toπ^0π^0γ$ decay are described simultaneously with the data on $ππ$ scattering and the $ππ\to K\bar K$ reaction. The description is carried out taking into account the chiral shielding of the putative $σ(600)$ meson and it's mixing with the well-established $f_0(980)$ meson. It is shown that the data don't contradict the existence of the $σ(600)$ meson and yield evidence in favor of the four-quark nature of the $σ(600)$ and $f_0(980)$ mesons.

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N. N Achasov, A. V. Kiselev. 2006-08-14. Properties of the light scalar mesons face the experimental data on the $ϕ\toπ^0π^0γ$ decay and the $ππ$ scattering. https://doi.org/10.1103/physrevd.73.054029%2010.1103%2Fphysrevd.74.059902

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