Minimal Dilaton Model

TL;DR

This paper proposes a minimal model where a light dilaton could explain the 125GeV particle observed at the LHC, challenging the traditional Higgs boson interpretation and fitting electroweak precision data.

Contribution

It introduces a calculable minimal dilaton model involving only top and Higgs sectors, compatible with current experimental constraints.

Findings

LHC data can be explained by a dilaton or Higgs-dilaton mixture.

The model accommodates a heavy Higgs while satisfying electroweak tests.

Distinct parameter regions support the dilaton as the 125GeV particle.

Abstract

We construct a minimal calculable model of a light dilaton based on the scenario where only top and Higgs sectors are involved in a quasiconformal dynamics. The model consistently accommodates the electroweak precision tests even when the Higgs boson is very heavy, thereby allowing one to consider the possibility that the particle at around 125GeV, discovered at the LHC experiments, is identified as the light dilaton rather than the Higgs boson. We find that the current LHC data allow distinct parameter regions where the observed particle is either mostly the Higgs boson or the dilaton.