Search for Single Top Quark Production at LEP2

A search for single top quark production via flavour changing neutral current (FCNC) was performed with ≈ 2.4 fb^-1 of data collected by the ALEPH, DELPHI, L3, and OPAL detectors at LEP at √ s = 189-209 {GeV} . The process e⁺e^- → tc(u) → bWc(u) has been searched for, with the W decaying into leptonic or hadronic final states. 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 energies are derived. Limits on the anomalous couplings κ_γ and κ_Z are determined from those results.