The 2HDM Doppelganger

TL;DR

This paper explores a model with extended gauge symmetry that, despite additional scalars, produces a scalar spectrum identical to the Two Higgs Doublet Model, with unique phenomenological implications.

Contribution

It introduces a gauge-extended model with an identical scalar spectrum to 2HDM but with distinct gauge structure and phenomenology.

Findings

Scalar spectrum matches 2HDM despite extra scalars

Presence of heavy vector bosons influences phenomenology

Model offers alternative insights into electroweak symmetry breaking

Abstract

We discuss the structure of a model with an extended gauge symmetry group $SU(2)\times SU(2)\times U(1)$ with a correspondingly rich Electroweak Symmetry Breaking structure. In spite of the additional scalar degrees of freedom in the model, the presence of the extra gauge group $SU(2)$ and its associated heavy vector bosons ensures that the scalar spectrum of the model after symmetry breaking is identical to that of the Two Higgs Doublet Models. We construct the model and discuss its implications, specifically the phenomenology associated with this class of models in contrast to the 2HDM.