e^+e^- Annihilations into Quasi-two-body Final States at 10.58 GeV

Abstract

We report the first observation of $e^+e^-$ annihilations into hadronic states of positive $C$-parity, $\rho^0 \rho^0$ and $\phi\rho^0$. The angular distributions support two-virtual-photon annihilation production. We also report the observations of $e^+e^-\to \phi\eta$ and a preliminary result on $e^+e^-\to \rho^+\rho^-$.