Measurement of the final states $ωπ^0$, $ρη$, and $ρη^{'}$ from $\psip$ electromagnetic decays and $\ee$ annihilations

Abstract

Cross sections and form factors for $\ee \to \wpi$, $ρη$, and $ρ\etap$ at center of mass energies of 3.650, 3.686, and 3.773 GeV are measured using data samples collected with the BESII detector at the BEPC. Also, the branching fractions of $ψ(2S) \rar \wpi$, $ρη$, and $ρ\etap$ are determined to be $(1.87^{+0.68}_{-0.62}\pm0.28)\times 10^{-5}$, $(1.78^{+0.67}_{-0.62}\pm0.17)\times 10^{-5}$, and $(1.87^{+1.64}_{-1.11}\pm0.33)\times10^{-5}$, respectively.