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.
A Global Analysis of the Standard Model Effective Field Theory in the Production and Decay Channels of a Single Top Quark
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abstract
A global analysis of the Standard Model Effective Field Theory (SMEFT) with SFitter is performed using measurements of single top quark production and top quark decay processes from ATLAS and CMS at center-of-mass energies of 7, 8 and 13 TeV. NLO QCD corrections are included in the theoretical predictions of all involved processes. Correlations among theoretical and experimental uncertainties are accounted for using DataPrep, which has been developed by the author. Using the dataset prepared by this software, constraints for the relevant degrees of freedom are derived. Almost all constraints are more than three times more stringent than the values of the literature. This thesis sets the technical and conceptual framework for a global fit of the entire top quark and Higgs boson sectors, which the author is involved in. The project marks an important milestone towards a truly global analysis constraining physics beyond the Standard Model in a model-independent way.
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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.