Revisiting Inert Doublet Model Parameters

TL;DR

This paper explores how recent measurements of Z+photon and di-photon signals, along with dark matter constraints, impact the parameter space of the Inert Doublet Model and investigates radiative corrections to the Higgs coupling.

Contribution

It provides a comprehensive analysis of the IDM parameter space considering current experimental bounds and calculates one-loop corrections to the Higgs trilinear coupling.

Findings

Measurement of $ ext{m}_ ext{gaga}$ and $ ext{m}_ extugaZ$ significantly constrain IDM parameters.

XENON1T bounds are compatible with certain IDM parameter regions.

One-loop corrections to the Higgs coupling are substantial within the allowed parameter space.

Abstract

In this study, we aim to see how much the actual measurement of the Z+photon and di-photon signal strength, $\mugaga$ and $\mugaZ$, could influence the allowed parameter space of the Inert Doublet Model (IDM), and to what extent such measurement can be aligned with the latest bound from XENON1T experiment on the spin-independent dark-matter-nucleon scattering cross-section. Also, by considering the new embedded scalars in the IDM (i.e., $H$, $A$, and $H^\pm$), a wide investigation of the one-loop radiative corrections to the trilinear Higgs coupling $hhh$ has been made in the light of the previous measurements.