Properties of the light scalar mesons face experimental data
N. N. Achasov
Abstract
The following topics are considered. 1) Confinement, chiral dynamics, and light scalar mesons. 2) Chiral shielding of the σ(600) 3)The ϕmeson radiative decays about nature of light scalar resonances. 4) The J/ψdecays about nature of light scalar resonances. 5) The a0(980)γγand f0(980)γγdecays about nature of light scalar resonances. 6) New round in γγπ+π-, the Belle data. 7) The a0(980)-f0(980) mixing: theory and experiment. Arguments in favor of the four-quark model of the a0(980) and f0(980) mesons are given.
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