Data collected around vs root s = 91 GeV by the OPAL experiment at the LEP e(+)e(-) collider are used to study the mechanism of baryon formation. As the signature, the fraction of Sigma(-) hyperons whose baryon number is compensated by the production of a (Sigma(-)) over bar, (Lambda) over bar or (Xi(-)) over bar antihyperon is determined. The method relies entirely on quantum number correlations of the baryons, and not rapidity correlations, making it more model independent than previous studies. Within the context of the JETSET implementation of the string hadronization model, the diquark baryon production model without the popcorn mechanism is strongly disfavored with a significance of 3.8 standard deviations including systematic uncertainties. It is shown that previous studies of the popcorn mechanism with Lambda(Lambda) over bar and p pi(p) over bar correlations are not conclusive, if parameter uncertainties are considered.
