A partially composite Goldstone Higgs

TL;DR

This paper proposes a model where the Higgs boson emerges as a partially composite Goldstone boson from a strongly interacting fermionic sector coupled to scalars, unifying various composite Higgs and Technicolor approaches.

Contribution

It introduces a new dynamical model with a partially composite Goldstone Higgs, unifying different composite Higgs and Technicolor frameworks within a single theoretical setup.

Findings

The Higgs arises as a Goldstone boson in the model.

The model can reproduce both composite Higgs and Technicolor scenarios.

Explicit symmetry-breaking terms generate a realistic Higgs mass.

Abstract

We consider a model of dynamical electroweak symmetry breaking with a partially composite Goldstone Higgs. The model is based on a strongly-interacting fermionic sector coupled to a fundamental scalar sector via Yukawa interactions. The SU(4) x SU(4) global symmetry of these two sectors is broken to a single SU(4) via Yukawa interactions. Electroweak symmetry breaking is dynamically induced by condensation due to the strong interactions in the new fermionic sector which further breaks the global symmetry SU(4) to Sp(4). The Higgs boson arises as a partially composite state which is an exact Goldstone boson in the limit where SM interactions are turned off. Terms breaking the SU(4) global symmetry explicitly generate a mass for the Goldstone Higgs. The model realizes in different limits both (partially) composite Higgs and (bosonic) Technicolor models, thereby providing a convenient unified framework for phenomenological studies of composite dynamics. It is also a dynamical extension of the recent elementary Goldstone-Higgs model.