Including dimension-8 SMEFT operators alters the allowed parameter space for dimension-6 coefficients in fits to top-decay helicity fractions due to non-trivial correlations and degeneracies at O(Λ^{-4}).
Complete Set of Dimension-8 Operators in the Standard Model Effective Field Theory
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W-boson helicity fractions in top decay as probes of dimension-6 and dimension-8 SMEFT operators
Including dimension-8 SMEFT operators alters the allowed parameter space for dimension-6 coefficients in fits to top-decay helicity fractions due to non-trivial correlations and degeneracies at O(Λ^{-4}).