Abstract
In the framework of type-II two-Higgs-doublet model with a singlet scalar dark matter $S$, we study the dark matter observables, the electroweak phase transition, and the gravitational wave signals by such strongly first order phase transition after imposing the constraints of the LHC Higgs data. We take the heavy CP-even Higgs $H$ as the only portal between the dark matter and SM sectors, and find the LHC Higgs data and dark matter observables require $m_S$ and $m_H$ to be larger than 130 GeV and 360 GeV for $m_A=600$ GeV in the case of the 125 GeV Higgs with the SM-like coupling. Next, we carve out some parameter space where a strongly first order electroweak phase transition can be achieved, and find benchmark points for which the amplitudes of gravitational wave spectra reach the sensitivities of the future gravitational wave detectors.
Highlights
The weakly interacting massive particle is a primary candidate for dark matter (DM) in the present Universe
In this paper we focus on the strong first order electroweak phase transition (SFOEWPT), which is required by a successful explanation of the observed baryon asymmetry of the Universe (BAU) and can produce primordial gravitational wave (GW) signals
We examine the status of the 2HDM with a singlet scalar DM (2HDMIID) confronted with the recent LHC Higgs data, the DM observables, and SFOEWPT, and discuss the detectability of GW at the future GW detectors
Summary
The weakly interacting massive particle is a primary candidate for dark matter (DM) in the present Universe. The flavor observables and the LHC searches for the Higgs boson can impose strong constraints on the type II 2HDM. In the type II 2HDM with a singlet scalar DM (2HDMIID), the two CP-even states h and H may be portals between the DM and SM sectors, and there is plentiful parameter space satisfying the direct and indirect experimental constraints of DM. We first examine the parameter space of the 2HDMIID using the recent LHC Higgs data and DM observables. III and IV, we show the allowed parameter space after imposing the limits of the LHC Higgs data and DM observables.
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