A Composite 2-Higgs Doublet Model

TL;DR

This paper explores a composite Higgs model with two Higgs doublets arising from a specific symmetry breaking, analyzing its properties and potential collider signatures at the LHC.

Contribution

It introduces a novel composite 2-Higgs doublet model derived from SO(6) symmetry breaking, detailing its phenomenology and collider signatures.

Findings

Modified Higgs couplings compared to the Standard Model

Predicted signatures of heavier Higgs states at the LHC

Dependence of Higgs properties on composite sector parameters

Abstract

In the context of Composite Higgs Models we consider the realisation of an extended Higgs sector with two Higgs doublets arising as pseudo Nambu-Goldstone bosons from a $\textrm{SO}(6) \to \textrm{SO}(4) \times \textrm{SO}(2)$ breaking. The properties of the Higgses are obtained in terms of the fundamental parameters of the composite sector, such as masses, Yukawa and gauge couplings of the new spin-1/2 and spin-1 resonances. After computing the Higgs potential from the explicit breaking of the $\textrm{SO}(6)$ global symmetry by the partial compositeness of fermions and gauge bosons, the main focus is to derive the phenomenological properties of the Higgs bosons and to highlight the main signatures of the Composite 2-Higgs Doublet Model at the Large Hadron Collider, including modifications to the SM-like Higgs couplings, production and decay channels of heavier Higgs states.