Search for single top quark production in pp¯ collisions at s=1.96TeV

Abstract We present a search for electroweak production of single top quarks in the s -channel and t -channel using neural networks for signal–background separation. We have analyzed 230 pb −1 of data collected with the DO detector at the Fermilab Tevatron Collider at a center-of-mass energy of 1.96 TeV and find no evidence for a single top quark signal. The resulting 95% confidence level upper limits on the single top quark production cross sections are 6.4 pb in the s -channel and 5.0 pb in the t -channel.