Aspects of a nonminimal conformal extension of the standard model

TL;DR

This paper explores a conformal extension of the standard model with additional scalar fields, analyzing its theoretical structure and phenomenological implications, especially regarding a new scalar resonance and its decay patterns.

Contribution

It introduces a nonminimal conformal extension with a scalar sector including a singlet and triplet, and examines its phenomenology and constraints related to symmetry enhancement.

Findings

Identification of the Higgs as a pseudo-Nambu-Goldstone boson of broken scale invariance

Decay pattern analysis of the new scalar resonance

Constraints on parameter space from symmetry considerations

Abstract

In this article we investigate a conformal extension of the standard model in which the scalar sector consists of a standard model Higgs doublet, a real gauge singlet and a real $SU(2)_{L}$ triplet. Focusing on the scenario where the Higgs boson found at the LHC is identified as the pseudo-Nambu-Goldstone boson of broken scale invariance, various theoretical and phenomenological features of the model are discussed. In particular, we analyze the decay pattern of the new scalar resonance. We also show that when the mass of this new scalar resonance is far below the $WW$ threshold, the natural regions of the parameter space are reduced by a constraint associated with the symmetry enhancement due to the decoupling of the singlet scalar from the rest of the system.