$0^{++}$ Resonances Observed at BES

Abstract

In last 10 years, $0^{++}$ resonances have been observed and studied at BES in many processes, such as $J/\psi \to \gamma {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$, $\gamma {\pi }^{+}{\pi }^{-}$, $\gamma {\pi }^0{\pi }^0$, $\gamma K^{+}{K}^{-}$, $\gamma K_S{K}_S$, $\gamma \omega \varphi$, $\omega {\pi }^{+}{\pi }^{-}$, $\omega K^{+}{K}^{-}$, $\varphi {\pi }^{+}{\pi }^{-}$, $\varphi K^{+}{K}^{-}$, $\psi (2S)\to J/\psi {\pi }^{+}{\pi }^{-}$, ${\chi }_{c0}\to {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$, ${\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ etc.. The results on $0^{++}$ resonances observed at BES are reviewed.

Plenary talk at SCADRON70, Lisbon, Feb. 2008