Abstract
We study the electroweak phase transition in the framework of scalar singlet-doublet mixed dark matter model, where the particle dark matter candidate is the lightest neutral Higgs that comprised of the CP-even component of inert doublet and a singlet scalar. The dark matter can be dominated by the inert doublet or singlet scalar depending on the mixing. We present several benchmark models to investigate the two situations after imposing several theoretical and experimental constraints. An additional singlet scalar and the inert doublet drive the electroweak phase transition to be strongly first order. A strong first order electroweak phase transition and a viable dark matter candidate can be accomplished in two benchmark models simultaneously, where a proper mass splitting among the neutral and charged Higgs masses is needed.
Highlights
The dark matter (DM) relic abundance and baryon asymmetry of the Universe (BAU) are two fundamental problems puzzling cosmologists and physicists
It could be very intriguing if new physics can explain DM relic abundance and accomplish a strong first-order electroweak phase transition (EWPT)
We study dark matter phenomenology and the EWPT in the scalar singlet-doublet mixed DM model
Summary
The dark matter (DM) relic abundance and baryon asymmetry of the Universe (BAU) are two fundamental problems puzzling cosmologists and physicists. The model that can provide a strong firstorder EWPT might drive deviation of the triple Higgs coupling from the SM prediction, which can be detected at a future high-energy proton-proton collider [3,4] It could be very intriguing if new physics can explain DM relic abundance and accomplish a strong first-order EWPT. We study dark matter phenomenology and the EWPT in the scalar singlet-doublet mixed DM model. A proper mixture characterizes the realization of the strong firstorder EWPT In this model, we find that the additional singlet along with the mixing effects makes the situation of the EWPT different from the IDM; two benchmarks with moderate dark matter mass are allowed to gain the correct relic abundance and to achieve a strong first-order EWPT.
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