Review of Experimental Studies of $\psi(3770)$ non-$D\bar D$ Decays

TL;DR

This review summarizes experimental findings on the non-$Dar D$ decays of the $psi(3770)$ resonance, highlighting the measured branching fractions and their implications for understanding its decay channels.

Contribution

It compiles and analyzes experimental data to determine the non-$Dar D$ decay branching fractions of $psi(3770)$, providing a comprehensive overview of current measurements and their consistency.

Findings

Non-$Dar D$ branching fraction is approximately 20%.

Light hadron decay modes can account for up to 11%.

Total non-$Dar D$ decay rate is about 13%.

Abstract

We review the progress on experimental studies of the non-$D\bar D$ decays of the $\psi(3770)$ resonance. With the world average of the observed cross sections for $D\bar D$ production measured at 3.773 GeV by the MARK-I, MARK-II, BES and CLEO Collaborations, combined together with the cross section for $\psi(3770)$ production at its peak as well as initial state radiative correction factor, we find that the non-$D\bar D$ branching fraction of $\psi(3770)$ decays is $B[\psi(3770)\to {\rm non}-D\bar D]=(19.8\pm 1.8 \pm 5.6)%$, which is consistent within error with $B[\psi(3770)\to {\rm non}-D\bar D]=(14.7\pm 3.2)%$ measured previously by the BES Collaboration. In addition, a global amplitude analysis of the cross sections for $e^+e^- \to {\rm LH}$ (LH= light hadron) measured by the CLEO Collaboration shows that the light hadron branching fraction of $\psi(3770)$ decays can be as large as about 11%. Combing the totally measured hadronic and electromegnatic transition rate together with the light hadron branching fraction in the decays of $\psi(3770)$ yields the total non-$D\bar D$ branching fraction in the decays of $\psi(3770)$ to be about 13%.