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Top quark electroweak couplings at future lepton colliders
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abstract
We perform a comparative study of the reach of future $e^+e^-$ collider options for the scale of non-resonant new physics effects in the top quark sector, phrased in the language of higher-dimensional operators. Our focus is on the electroweak top quark pair production process $e^+e^- \to Z^*/\gamma \to t\bar t $, and we study benchmark scenarios at the ILC and CLIC. We find that both are able to constrain mass scales up to the few TeV range in the most sensitive cases, improving by orders of magnitude on the forecasted capabilities of the LHC. We discuss the role played by observables such as forward-backward asymmetries, and making use of different beam polarisation settings, and highlight the possibility of lifting a degeneracy in the allowed parameter space by combining top observables with precision $Z$-pole measurements from LEP1.
Forward citations
Cited by 3 Pith papers
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Effective field theory and scalar extensions of the top quark sector
For a heavy scalar coupled to top quarks, only an NLO-matched effective field theory reproduces the full model across the LHC energy range, while a leading-order fit overestimates the high-mass tail and LHC constraints.
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Bottom quark electroweak dipole moments at a high-energy $\mu-$collider
A high-energy muon collider can set stronger limits on d=6 SMEFT operators for b-quark electroweak dipoles than existing EW precision data or B to Xs gamma measurements by studying bb and bbh final states.
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Constraining the top quark effective field theory using the top quark pair production in association with a jet at future lepton colliders
Simulated e+e- -> ttbar + jet events at 500 GeV and 3 TeV show future lepton colliders could limit top-quark SMEFT Wilson coefficients down to 10^-3 to 10^-4 at 95% CL.
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