The top quark electro-weak couplings after LHC Run 2

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.

References in corpus (48)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Dimension-Six Terms in the Standard Model Lagrangian
• Observation of the Top Quark
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• NNLL resummation for s-channel single top quark production
• HATHOR for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions
• A minimal set of top anomalous couplings
• BAT - The Bayesian Analysis Toolkit
• Top, Higgs, Diboson and Electroweak Fit to the Standard Model Effective Field Theory
• A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector
• Effective-Field-Theory Approach to Top-Quark Production and Decay
• O new physics, where art thou? A global search in the top sector
• Constraining the top-Higgs sector of the Standard Model Effective Field Theory
• Automated one-loop computations in the SMEFT
• Large NLO corrections in $t\bar{t}{W}^{\pm }$ and $t\bar{t}t\bar{t}$ hadroproduction from supposedly subleading EW contributions
• Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future
• Right-handed charged currents in the era of the Large Hadron Collider
• Helicity fractions of W bosons from top quark decays at NNLO in QCD
• Putting SMEFT Fits to Work
• $\text{HEPfit}$: a Code for the Combination of Indirect and Direct Constraints on High Energy Physics Models
• Current and future constraints on Higgs couplings in the nonlinear Effective Theory
• Top-quark pair hadroproduction in association with a heavy boson at NLO+NNLL including EW corrections
• A global fit of top quark effective theory to data
• Strong tW Scattering at the LHC
• Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• The leptonic future of the Higgs
• The electro-weak couplings of the top and bottom quarks -- global fit and future prospects
• Top and Beauty synergies in SMEFT-fits at present and future colliders
• Effective field theory approach to top-quark decay at next-to-leading order in QCD
• Dimension-six electroweak top-loop effects in Higgs production and decay
• The Flavor of UV Physics
• Constraining top-quark couplings combining top-quark and $\mathbf{B}$ decay observables
• Global fits in the Aligned Two-Higgs-Doublet model
• Probing top-quark couplings indirectly at Higgs factories
• Measurement of the associated production of a single top quark and a Z boson in pp collisions at $\sqrt{s}=$ 13 TeV
• Hard Photons in Hadroproduction of Top Quarks with Realistic Final States
• Observation of single top quark production in association with a Z boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for new physics in top quark production with additional leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV using effective field theory
• Present and future constraints on top EW couplings
• Off-shell vs on-shell modelling of top quarks in photon associated production
• The top-quark window on compositeness at future lepton colliders
• Combined SMEFT interpretation of Higgs, diboson, and top quark data from the LHC
• Measurements of inclusive and differential cross-sections of combined $t\bar{t}\gamma$ and $tW\gamma$ production in the $e\mu$ channel at 13 TeV with the ATLAS detector
• Evidence for the associated production of a single top quark and a photon in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Precise predictions for $t\bar{t}\gamma /t\bar{t}$ cross section ratios at the LHC
• Measuring the top energy asymmetry at the LHC: QCD and SMEFT interpretations
• Constraints on coloured scalars from global fits

Cited by in corpus (6)

• 50 Years of Quantum Chromodynamics
• Single top production in association with a $WZ$ pair at the LHC in the SMEFT
• Probing Top-quark Operators with Precision Electroweak Measurements
• Constraining the SMEFT with a differential cross section measurement of $tWZ$ production at the HL-LHC
• Top quark effective couplings from top-pair tagged photoproduction in $p{e}^{-}$ collisions
• SMEFT Analysis of $m_W$