Higgs physics beyond the SM: the non-linear EFT approach

TL;DR

This paper discusses how different effective field theories can distinguish whether the Higgs boson is elementary or composite, focusing on low-energy signals and coupling patterns in a model-independent framework.

Contribution

It provides a model-independent analysis of low-energy signals and coupling patterns to identify the nature of the Higgs boson within non-linear EFT approaches.

Findings

Identification of low-energy signals distinguishing elementary and composite Higgs

Patterns of effective couplings characteristic of specific composite Higgs models

Framework applicable in a model-independent manner

Abstract

Depending on whether electroweak physics beyond the Standard Model is based on a linear or on a non-linear implementation of the electroweak symmetry breaking, a linear or a chiral Effective Lagrangian is more appropriate. In this talk, the main low-energy signals that allow to recognize whether the observed Higgs scalar is a dynamical (composite) particle or rather an elementary one are presented, in a model-independent way. The patterns of effective couplings produced upon the assumption of specific composite Higgs models are also discussed.