The Dilaton-like Higgs boson with scalar singlet dark matter

TL;DR

This paper explores a model where a dilaton-like Higgs and a scalar singlet dark matter candidate are consistent with current experimental data, constraining their properties and interactions.

Contribution

It updates the status of the dilaton as the 125 GeV Higgs-like boson and constrains the model parameters using recent collider and dark matter detection data.

Findings

Dilaton-$bb$ coupling close to SM values

Dark matter mass > half of dilaton mass

Upcoming experiments will further constrain dark matter mass

Abstract

We study a model with a Higgs-like dilaton and a Standard Model gauge-singlet scalar dark matter candidate. We begin by updating the status of identifying the observed 125 GeV Higgs-like boson with the pseudo Nambu-Goldstone boson that arises from the spontaneous breaking of scale invariance using recent Higgs boson signal strength measurements by the ATLAS and CMS collaborations. We then constrain the extended model with recent constraints on the Higgs invisible width, the observed dark matter relic abundance and the latest dark matter direct detection limits. We found that the magnitude of the dilaton-$\gamma\gamma$ and dilaton-glue-glue coupling is constrained to be close to the standard model values. The mass of the dark matter candidate is contrained to be greater than half the dilaton mass by relic abundance limits and Higgs invisible width limits. Dark matter direct detection limits allow only small mass regions which will be further constrained by upcoming DEAP measurements.