A light Higgs scenario based on the TeV-scale supersymmetric strong dynamics

TL;DR

This paper proposes a supersymmetric QCD-based model with multiple Higgs doublets and singlets, predicting a 125 GeV Higgs and a strong first-order phase transition suitable for electroweak baryogenesis.

Contribution

It introduces a novel TeV-scale strong dynamics framework with composite Higgs fields that naturally explains the light Higgs mass and enhances the triple Higgs coupling.

Findings

Predicts a 125 GeV Higgs boson from loop effects of composite fields.

Shows significant non-decoupling effects in Higgs self-couplings.

Supports a strong first-order phase transition for baryogenesis.

Abstract

We consider a model based on the supersymmetric QCD theory with N_c=2 and N_f=3. The theory is strongly coupled at the infrared scale \Lambda_H. Its low energy effective theory below \Lambda_H is described by the supersymmetric standard model with the Higgs sector that contains four iso-spin doublets, two neutral iso-spin singlets and two charged iso-spin singlets. If \Lambda_H is at the multi-TeV to 10 TeV, coupling constants for the F-terms of these composite fields are relatively large at the electroweak scale. Nevertheless, the SM-like Higgs boson is predicted to be as light as 125 GeV because these F-terms contribute to the mass of the SM-like Higgs boson not at the tree level but at the one-loop level. A large non-decoupling effect due to these F-terms appears in the one-loop correction to the triple Higgs boson coupling, which amounts to a few tens percent. Such a non-decoupling property in the Higgs potential realizes the strong first order phase transition, which is required for a successful scenario of electroweak baryogenesis.