A Study of parton fragmentation in hadronic Z0 decays using Lambda anti-Lambda correlations - INSPIRE

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A Study of parton fragmentation in hadronic Z0 decays using Lambda anti-Lambda correlations

OPAL

Collaboration

Jul, 1998

22 pages

Published in:

Eur.Phys.J.C 13 (2000) 185-195

e-Print:

hep-ex/9808031 [hep-ex]

DOI:

Report number:

CERN-EP-98-114

Experiments:

CERN-LEP-OPAL

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Abstract:

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.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
Lambda: pair production
final state: (2jet)
final state: (3jet)
correlation: (Lambda Antilambda)
rapidity: difference
angular distribution

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