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A bstract We establish constraints on the dimension-six four-heavy-quark operators in the Standard Model Effective Field Theory (SMEFT) by synthesising LHC measurements of top-quark and single-Higgs production with electroweak precision observables. We scrutinise the choice of the γ 5 scheme in single-Higgs calculations, demonstrating its non-negligible impact on SMEFT fits.
Noi et al. (Mon,) studied this question.