e^+e^- Annihilations into Quasi-two-body Final States at 10.58 GeV
We report the first observation of $e^+e^-$ annihilations into hadronic states of positive $C$-parity, $ρ^0 ρ^0$ and $ϕρ^0$. The angular distributions support two-virtual-photon annihilation production. We also report the observations of $e^+e^-\to ϕη$ and a preliminary result on $e^+e^-\to ρ^+ρ^-$.
hep-ex↗