A search for single top quarks at D-Zero

We present details of a search for electroweak production of single top quarks in the electron+jets and muon+jets decay channels. The measurements use ∼ 90 pb-1 of data from Run 1 of the Fermilab Tevatron collider, collected at 1.8 TeV with the DO detector. We use events that include a tagging muon, implying the presence of a b jet, to set an upper limit at the 95% confidence level on the cross section for the s-channel process pbar p -> tb + X of 39 pb. The upper limit for the t-channel process pbar p -> tqb + X is 58 pb