Speaker
Description
Effective field theories rely on truncated expansions whose interpretation is intertwined with redundancies from field redefinitions. This interplay raises important questions about power counting and the consistent assignment of theoretical uncertainties associated with neglected higher-dimensional operators.
In this talk, I use field redefinition invariance as a diagnostic tool to assess truncation effects, contrasting equation of motion substitutions with explicit field redefinitions. I show how this strategy extends familiar methods for estimating theoretical uncertainties in the renormalisable Standard Model to the non-renormalisable framework of effective theories. As a case study in the Higgs Effective Field Theory, I illustrate how universal Higgs modifications interplay with process-dependent sensitivities in realistic observables.