Properties of the light scalar mesons face experimental data

Abstract

The following topics are considered. 1) Confinement, chiral dynamics, and light scalar mesons. 2) Chiral shielding of the \sigma(600) 3)The \phi meson radiative decays about nature of light scalar resonances. 4) The J/\psi decays about nature of light scalar resonances. 5) The a0(980)\to\gamma\gamma and f0(980)\to\gamma\gamma decays about nature of light scalar resonances. 6) New round in \gamma\gamma\to\pi^+\pi^-, 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.

Comments: 12 pages, 6 figures, a few typos are removed, Plenary session talk at QUARKS-2006,Repino, St.Peterburg, May 19-25, 2006