Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production

Abstract

In 0.9 fb${}^{-1}$ of $p\bar{p}$ collisions, D0 has observed an excess of events with an isolated lepton, missing transve rse momentum, and two to four jets. This excess is consistent with single top quark production. We examine these data to study the Lorentz structure of the $Wtb$ coupling. The standard model predicts a left-handed vector coupling at the $Wtb$ vertex. The most general lowest dimension, CP-conserving Lagrangian admits right-handed vector and left- or right-h anded tensor couplings as well. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. These are the first direct constraints on a general $Wtb$ interaction and the first direct limits on left- and right-handed tensor couplings.

7 pages, 4 figures

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Cited by in corpus (23)

• Observation of Single Top-Quark Production
• Realistic Composite Higgs Models
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• Model-independent measurement of $\mathbf{t}$-channel single top quark production in $\mathbf{p}\bar{\mathbf{p}}$ collisions at $\sqrt{\mathbf{s}}=1.96$ TeV
• Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at sqrt(s) = 7 and 8 TeV
• Single top quark production and decay in the t-channel at next-to-leading order at the LHC
• Measurement of the t-channel single top quark production cross section
• Determination of the width of the top quark
• Measurements of single top quark production cross sections and |Vtb| in ppbar collisions at sqrt{s}=1.96 TeV
• The Top Quark Decay Vertex in Standard Model Extensions
• Next-to-leading order QCD corrections to s-channel single top quark production and decay at the LHC
• Anomalous Wtb couplings in gamma-proton collision at the LHC
• Search for anomalous Wtb couplings in single top quark production in ppbar collisions at sqrt(s) = 1.96 TeV
• Exploring anomalous top interactions via the final lepton in ttbar productions/decays at hadron colliders
• Search for anomalous top quark couplings with the D0 detector
• Top quark tensor couplings
• Review of Properties of the Top Quark from Measurements at the Tevatron
• Observation of Single Top Quark Production at the Tevatron Collider
• Modeling of anomalous Wtb interactions using subsidiary fields
• Observation of Single Top Quark Production
• tbW vertex in the Littlest Higgs Model with T-parity
• The right top coupling in the aligned two-Higgs-doublet model
• Single Top Quarks at the Tevatron