Updated results for minimal dilaton model

TL;DR

This paper revisits the minimal dilaton model as an alternative explanation for the 125GeV particle observed at the LHC, suggesting it could be a singlet scalar dilaton rather than the Standard Model Higgs, despite current experimental constraints.

Contribution

It introduces an updated analysis of the minimal dilaton model, highlighting its viability as an alternative to the SM Higgs in light of recent LHC results.

Findings

The singlet scalar dilaton can mimic Higgs signals around 125GeV.

Current experimental constraints disfavor certain parameter regions.

The model remains a plausible alternative to the SM Higgs interpretation.

Abstract

Both the ATLAS and CMS experiments at the LHC have reported the observation of the particle of mass around 125GeV which is consistent to the Standard Model (SM) Higgs boson, but with an excess of events beyond the SM expectation in the diphoton decay channel at each of them. There still remains room for a logical possibility that we are not seeing the SM Higgs but something else. Here we introduce the minimal dilaton model in which the LHC signals are explained by an extra singlet scalar of the mass around 125GeV that slightly mixes with the SM Higgs heavier than 600GeV. When this scalar has a vacuum expectation value well beyond the electroweak scale, it can be identified as a linearly realized version of a dilaton field. Though the current experimental constraints from the Higgs search disfavors such a region, the singlet scalar model itself still provides a viable alternative to the SM Higgs in interpreting its search results.