Measurements of the observed cross sections for exclusive light hadron production in e^+e^- annihilation at \sqrt{s}= 3.773 and 3.650 GeV

TL;DR

This study measures the cross sections of 12 exclusive light hadron final states in electron-positron collisions at energies near 3.7 GeV, providing insights into $ ext{psi}(3770)$ decays and setting upper limits on their branching fractions.

Contribution

First measurement of observed cross sections for specific light hadron final states at these energies, including limits on $ ext{psi}(3770)$ decay contributions.

Findings

Measured cross sections for 12 final states at 3.773 and 3.650 GeV.

Set upper limits on $ ext{psi}(3770)$ decay branching fractions.

Provided data for understanding charmonium decay mechanisms.

Abstract

By analyzing the data sets of 17.3 pb$^{-1}$ taken at $\sqrt{s}=3.773$ GeV and 6.5 pb$^{-1}$ taken at $\sqrt{s}=3.650$ GeV with the BESII detector at the BEPC collider, we have measured the observed cross sections for 12 exclusive light hadron final states produced in $e^+e^-$ annihilation at the two energy points. We have also set the upper limits on the observed cross sections and the branching fractions for $\psi(3770)$ decay to these final states at 90% C.L.