Update of the measurement of the cross section for e^+e^- -> psi(3770) -> hadrons

TL;DR

This paper updates the measurement of the e^+e^- -> psi(3770) cross section, correcting previous errors and incorporating new data to refine the upper limit on non-DDbar decay modes.

Contribution

It provides a corrected and more precise measurement of the psi(3770) production cross section and sets a new upper limit on its non-DDbar decay branching fraction.

Findings

Corrected the error in cross section difference calculation.

Used recent CLEO data for improved accuracy.

Established an upper limit of 9% on non-DDbar decays.

Abstract

We have updated our measurement of the cross section for e^+e^- -> psi(3770) -> hadrons, our publication "Measurement of sigma(e^+e^- -> psi(3770) -> hadrons) at E_{c.m.} = 3773 MeV", arXiv:hep-ex/0512038, Phys.Rev.Lett.96, 092002 (2006). Simultaneous with this arXiv update, we have published an erratum in Phys.Rev.Lett.104, 159901 (2010). There, and in this update, we have corrected a mistake in the computation of the error on the difference of the cross sections for e^+e^- -> psi(3770) -> hadrons and e^+e^- -> psi(3770) -> DDbar. We have also used a more recent CLEO measurement of cross section for e^+e^- -> psi(3770) -> DDbar. From this, we obtain an upper limit on the branching fraction for psi(3770) -> non-DDbar of 9% at 90% confidence level.