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2014

Limits on anomalous top quark gauge couplings from Tevatron and LHC data

Fabbrichesi, M., Pinamonti, M., Tonero, A.

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We review and update current limits on possible anomalous couplings of the top quark to gauge bosons.

We consider data from top quark decay (as encoded in the $W$-boson helicity fractions) and single-top production (in the $t$-, $s$- and $Wt$-channels).
We find improved limits with respect to previous results (in most cases of almost one order of magnitude) and extend the analysis to include four-quark operators.
We find that new electroweak physics is constrained to live above an energy scale between 430 GeV and 3.2 TeV (depending on the form of its contribution); strongly interacting new physics is bounded by scales higher than 1.3 or 1.5 TeV (again depending on its contribution).

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[CMS Collaboration], “Measurement of W-helicity fractions in single top events topology,” CMS-PAS-TOP-12-020

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