Search for single top quark production at LEP-2

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 κ γ and κ Z are determined from these results.

Note:

21 pages, 4 figures, Submitted to Phys. Lett. B Report-no: CERN-EP-2001-066

electron positron: colliding beams
electron positron: annihilation
top
quark: electroproduction
neutral current: flavor changing
top: decay
W: decay modes
channel cross section: energy dependence
upper limit
gauge boson: coupling

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