Speaker
Description
The Standard Model and Higgs Effective Field Theories (SMEFT and HEFT) are the two well-established theoretical frameworks for the parameterization of potential new physics signals from nearly decoupled BSM sectors. They differ in the scalar field content and - most notably - in the power counting, i.e. the way they organize BSM effects into a series expansion. While it's clear that in SMEFT one simply expands in inverse powers of the EFT cutoff, the HEFT power counting generates recurring confusion, which can be traced back to the simultaneous presence of linear and non-linear field representations in the theory.
This talk revisits general power counting rationales in EFTs to obtain a possible consistent (and simple) prescription for HEFT. It will also discuss an example application to double Higgs production in gluon fusion, which is one of the main test benches for HEFT-SMEFT comparisons at the LHC.
