Search for single top quarks in the tau+jets channel using 4.8 fb${}^{-1}$ of $p\bar{p}$ collision data

Abstract

We present the first direct search for single top quark production using tau leptons. The search is based on 4.8 fb${}^{-1}$ of integrated luminosity collected in $p\bar{p}$ collisions at $\sqrt{s}$=1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. We select events with a final state including an isolated tau lepton, missing transverse energy, two or three jets, one or two of them $b$ tagged. We use a multivariate technique to discriminate signal from background. The number of events observed in data in this final state is consistent with the signal plus background expectation. We set in the tau+jets channel an upper limit on the single top quark cross section of \TauLimObs pb at the 95% C.L. This measurement allows a gain of 4% in expected sensitivity for the observation of single top production when combining it with electron+jets and muon+jets channels already published by the D0 collaboration with 2.3 fb${}^{-1}$ of data. We measure a combined cross section of $\SuperCombineXSall$ pb, which is the most precise measurement to date.

12 pages, 5 figures

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• Observation of Single Top-Quark Production
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Cited by in corpus (12)

• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production
• NNLL resummation for s-channel single top quark production
• Next-to-next-to-leading soft-gluon corrections for the top quark cross section and transverse momentum distribution
• Observation of Single Top Quark Production and Measurement of |Vtb| with CDF
• Top-quark production and QCD
• Top-quark transverse-momentum distributions in t-channel single-top production
• Observation of Single Top Quark Production at the Tevatron Collider
• Observation of Single Top Quark Production
• Measurements of the Production, Decay and Properties of the Top Quark: A Review
• Top Quark Physics at the Tevatron
• Studies of single top quark production at the Tevatron