A New Analysis of the R Measurements: Resonance Parameters of the Higher Vector States of Charmonium

TL;DR

This paper critically examines existing R measurements in e+e- annihilation, providing refined resonance parameters for higher vector states of charmonium with improved accuracy and smaller errors.

Contribution

It offers a new analysis of experimental data leading to more precise resonance parameters for higher charmonium vector states.

Findings

Resonance widths are significantly different from previous values.

Crystal Ball and BES measurements are in excellent agreement.

Results have much smaller errors than earlier estimates.

Abstract

The existing experimental data on total cross sections for hadron production in e+e- annihilation in the resonance region sqrt(s) = 3.8 - 4.8 GeV, usually presented in terms of the parameter R, are critically examined. It is shown that the Crystal Ball and BES measurements are in excellent agreement, and their analysis leads to consistent resonance parameters f or the three vector resonances above the DD-bar threshold. The results for the widths are found to be considerably different from the presently adopted values, and have much smaller err ors.