Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-10-12
Eur.Phys.J.C64:609-625,2009
Physics
High Energy Physics
High Energy Physics - Experiment
No of pages 31 - No of figures 7
Scientific paper
10.1140/epjc/s10052-009-1175-z
Data collected around sqrt{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-, Lambda or Xi- 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. The diquark fragmentation 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 are not conclusive if parameter uncertainties are considered.
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