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The top quark electro-weak couplings after LHC Run 2

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arxiv 2107.13917 v3 pith:JGXFBEZK submitted 2021-07-29 hep-ph hep-ex

classification hep-phhep-ex
keywords measurementsanalysiseffectiveelectro-weakfieldglobalmodelquark
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

Recent measurements at the Large Hadron Collider allow for a robust and precise characterisation of the electro-weak interactions of the top quark. We present the results of a global analysis at next-to-leading order precision including LHC, LEP/SLD and Tevatron data in the framework of the Standard Model Effective Field Theory. We include a careful analysis of the impact of correlations among measurements, as well as of the uncertainties in the Effective Field Theory setup itself. We find remarkably robust global fit results, with central values in good agreement with the Standard Model prediction, and 95% probability bounds on Wilson coefficients that range from $\pm$ 0.35 to $\pm$ 8 TeV$^{-2}$. This result represents a considerable improvement over previous studies, thanks to the addition of differential cross-section measurements in associated production processes of top quarks and neutral gauge bosons.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Light scalars within the $\mathcal{CP}$-conserving Aligned-two-Higgs-doublet model

    hep-ph 2024-12 conditional novelty 6.0 of 10

    All seven light-scalar scenarios of the CP-conserving aligned two-Higgs-doublet model contain sizeable parameter regions compatible with current collider and flavour data, with the lightest new scalars bounded by LEP ...

  2. Sensitivity to $\mathcal{CP}$-violating effective couplings in the top-Higgs sector

    hep-ph 2024-12 conditional novelty 5.0 of 10

    Combining ttbar H and single-top H production at the LHC can separate the real and imaginary parts of a CP-violating top Yukawa coupling, with projected HL-LHC constraints about twice as strong as current ATLAS bounds.

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