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

Collaboration, D0 and Bertram, Iain and Borissov, Guennadi and Fox, Harald and Williams, Mark and Ratoff, Peter and Love, Peter and Sopczak, Andre and Rakitin, Alexander (2008) Search for anomalous $\boldmath{Wtb}$ couplings in single top quark production. Physical review letters, 101 (22): 221801. ISSN 1079-7114

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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 $Wt b$ 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Additional Information:
© 2008 The American Physical Society 7 pages, 4 figures
Uncontrolled Keywords:
?? physics and astronomy(all) ??
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Deposited On:
30 Apr 2013 12:42
Last Modified:
23 Jan 2024 02:01