BES R measurements and $J/\psi$ decays

Ning Wu

R measurement results in 2--5 GeV region by BESII is reported in this talk. The study on $\sigma$ particle in $J/\psi \to \omega {\pi }^{+}{\pi }^{-}$, based on $7.8\times 10^6$ BESI $J/\psi$ data, is also repo…