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Search for single top quark production at LEP2

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • OPAL Collaboration
<mark>Journal publication date</mark>29/11/2001
<mark>Journal</mark>Physics Letters B
Issue number3-4
Number of pages14
Pages (from-to)181-194
Publication StatusPublished
<mark>Original language</mark>English


A search for single top quark production via flavour changing neutral currents (FCNC) was performed with data collected by the OPAL detector at the e+e− collider LEP. Approximately 600 pb−1 of data collected at √s = 189–209 GeV were used to search for the FCNC process e+e−→tc(u)→bWc(u). This analysis is sensitive to the leptonic and the hadronic decay modes of the W boson. No evidence for a FCNC process is observed. Upper limits at the 95% confidence level on the single top production cross-section as a function of the centre-of-mass energy are derived. Limits on the anomalous coupling parameters κγ and κZ are determined from these results.