The scalar mesons in multi-channel $\pi \pi$ scattering and decays of the $\psi$ and ${\rm Y}$ families

Yurii S. Surovtsev, Petr Bydzovsky, Thomas Gutsche +3

The $f_0$ mesons are studied in a combined analysis of data on the isoscalar S-wave processes $\pi \pi \to \pi \pi ,K\overline{K},\eta \eta$ and on decays $J/\psi \to \varphi (\pi \pi ,K\overline{K})$, $ψ(2S)\to J/ψ(π…