Light Scalar Mesons from Phi to Psi

Abstract

The following topics are considered. 1) Confinement, chiral dynamics, and light scalar mesons. 2) Chiral shielding of the $\sigma (600)$. 3) The $\varphi$ meson radiative decays about nature of light scalar resonances. 4) The $J/\psi$ decays about nature of light scalar resonances. 5) The $a_0(980)\to \gamma \gamma$ and $f_0(980)\to \gamma \gamma$ decays about nature of light scalar resonances. 6) New round in $\gamma \gamma \to {\pi }^{+}{\pi }^{-}$, the Belle data. Arguments in favor of the four-quark model of the $a_0(980)$ and $f_0(980)$ mesons are given.

Comments: 7 pages, 7 figures. Talk presented by N.N. Achasov at the International Workshop "e+e- Collisions from Phi to Psi", February 27--March 2, 2006, BINP, Novosibirsk, Russian Federation