Measurement of the final states $\omega \pi^0$, $\rho \eta$, and $\rho \eta^{'}$ from $\psip$ electromagnetic decays and $\ee$ annihilations

TL;DR

This study measures cross sections, form factors, and branching fractions for specific final states from $ ext{e}^+ ext{e}^-$ annihilations and $ ext{ψ}(2S)$ decays at energies around 3.7 GeV, providing precise experimental data.

Contribution

It provides the first measurements of cross sections, form factors, and branching fractions for $ ext{ω} ext{π}^0$, $ ho ext{η}$, and $ ho ext{η'}$ final states at these energies, improving understanding of these decay channels.

Findings

Branching fractions are on the order of 10^{-5}.

Measured cross sections and form factors at multiple energies.

Results are consistent with theoretical predictions within uncertainties.

Abstract

Cross sections and form factors for $\ee \to \wpi$, $\rho\eta$, and $\rho\etap$ 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 $\psi(2S) \rar \wpi$, $\rho\eta$, and $\rho\etap$ 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.