We report on measurements of the inclusive production rate of Sigma(+) and
Sigma(0) baryons in hadronic Z decays collected with the L3 detector at LEP
. The Sigma(+) baryons are detected through the decay Sigma(+) -->p pi(0),
while the Sigma(0) baryons are detected via the decay mode Sigma(0) -->Lamb
da gamma. The average numbers of Sigma(+) and Sigma(0) per hadronic Z decay
are measured to be:
[NSigma+]+[ NSigma+] = 0.114 +/- 0.011(stat) +/- 0.009(syst)
[N-Sigma 0] + [N-Sigma 0] = 0.095 +/- 0.015(stat) +/- 0.013(syst).
These rates are found to be higher than the predictions from Monte Carlo ha
dronization models and analytical parameterizations of strange baryon produ
ction. (C) 2000 Elsevier Science B.V. All rights reserved.