Search for Single Top Quark Production Using Likelihood Discriminants at D0 in Run II

Details Search for Single Top Quark Production Using Likelihood Discriminants at D0 in Run II Search for Single Top Quark Production Using Likelihood Discriminants at D0 in Run II

2007-07-11

arxiv.org/abs/0707.1550v1

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, 13 figures, to appear in proceeding of The Hadron Collider Physics Symposium 2006, Durham, North Carolina, USA

Scientific paper

We present an improved search for single top quarks in two production modes, s-channel (tb) and t-channel (tqb). The search is performed in the electron+jets and muon+jets decay channels, with one or more b-tagged jets, on nearly 370 pb^{-1} of D0 Run II data collected between August 2002 and October 2004. Impact-parameter based b-quark tagging is used to select signal-like events. We use a likelihood discriminant method to separate signals from backgrounds. The resulting expected/observed 95% confidence level upper limits on the single top quark production cross sections are 3.3/5.0pb (s-channel) and 4.3/4.4pb (t-channel).

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