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Polarization and forward-backward asymmetry of ΛΛ baryons in hadronic Z0 decays

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • OPAL Collaboration
<mark>Journal publication date</mark>03/1998
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number1
Number of pages11
Pages (from-to)49-59
Publication StatusPublished
<mark>Original language</mark>English


The longitudinal polarization, the transverse polarization, and the forward-backward asymmetry of ΛΛ baryons, have been measured using a sample of 4.34 million hadronic Z0Z0 decays collected with the OPAL detector at LEP between 1990 and 1995. These results are important as an aid to the understanding of hadronization mechanisms. Significant longitudinal polarization has been observed at intermediate and high momentum. For xExE ( ≡2EΛ/s√)>≡2EΛ/s)> 0.3, the longitudinal polarization has been measured to be −32.9±5.5−32.9±5.5 (stat) ±± 5.2 (syst)%. We have observed no transverse polarization. A significant forward-backward asymmetry has been measured and can be described by a JETSET model.