New Constraints on Higgs-portal Scalar Dark Matter

TL;DR

This paper refines constraints on Higgs-portal scalar dark matter, excluding certain mass regions and narrowing the viable high-mass window to 1.1-2.0 TeV, which upcoming experiments can test.

Contribution

It provides updated constraints on the scalar dark matter model considering multiple experimental and theoretical bounds, narrowing the viable mass range.

Findings

Resonant mass region is excluded.

High mass region is reduced to 1.1-2.0 TeV.

The remaining high mass window is testable by Xenon 1T.

Abstract

The simplest Higgs-portal scalar dark matter model, in which a real scalar singlet is added to the standard model, has been revisited, by taking into account the constraints from perturbativity, electroweak vacuum stability in the early Universe, dark matter direct detection, and Higgs invisible decay at the LHC. We show that the {\it resonant mass region} is totally excluded and the {\it high mass region} is reduced to a narrow window $1.1$ ~TeV $\leq m_{s} \leq$ $ 2.55$~ TeV, which is slightly reduced to $1.1$~TeV $\leq m_{s} \leq$ $ 2.0$~ TeV if the perturbativity is further imposed. This {\it high mass range} can be fully detected by the Xenon 1T experiment.