Speaker
Margherita Ghezzi
(PSI)
Description
In this talk l will review effective field theories (EFTs) for Higgs physics. In this framework one can study deviations from the Standard Model (SM) in a systematic way, under the assumption that New Physics is heavier than the electroweak scale and can be decoupled. I will show how the naive LO framework can be consistently extended to NLO in perturbation theory, and present some details of the renormalization procedure. The SM EFT can be extended to include new dynamical degrees of freedom, in case they are around the electroweak scale and an energy gap separates them from the other New Physics resonances. In particular, in the second part of the talk I will present the full set of dimension-6 operators for the 2-Higgs Doublet Model, as this model is one of the simplest extensions of the SM and well motivated by supersymmetry. Moreover, I will discuss some aspects of the breaking of the electroweak symmetry and of the diagonalization of the mass matrices of the Higgs bosons in presence of the effective operators.
