Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-08-28
Eur.Phys.J.C13:185-195,2000
Physics
High Energy Physics
High Energy Physics - Experiment
23 pages, LaTeX, 6 figures included plus 1 in colour, submitted to Physics Letters B
Scientific paper
10.1007/s100520050685
The correlated production of Lambda and Lambdabar baryons has been studied using 4.3 million multihadronic Zo decays recorded with the OPAL detector at LEP. Di-lambda pairs were investigated in the full data sample and for the first time also in 2-jet and 3-jet events selected with the k_t algorithm. The distributions of rapidity differences from correlated Lambda-Lambdabar pairs exhibit short-range, local correlations and prove to be a sensitive tool to test models, particularly for 2-jet events. The JETSET model describes the data best but some extra parameter tuning is needed to improve agreement with the experimental results in the rates and the rapidity spectra simultaneously. The recently developed modification of JETSET, the MOdified Popcorn Scenarium (MOPS), and also HERWIG do not give satisfactory results. This study of di-lambda production in 2- and 3-jet events supports the short-range compensation of quantum numbers.
et al Abbiendi G.
The OPAL Collaboration
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