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arXiv · 2410.14328

Degenerate scalar scenario of two Higgs doublet model with a complex singlet scalar

Gi-Chol Cho·Chikako Idegawa
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Abstract

We study the two Higgs doublet model with a complex singlet scalar whose imaginary part acts as dark matter (DM). The scattering of DM and quarks, mediated by three CP-even scalars in this model, is suppressed when masses of CP-even scalars are degenerate; that is called the ``degenerate scalar scenario''. Based on this scenario, we show that the strong first-order electroweak phase transition (EWPT) can be achieved without conflicting with constraints from the DM relic density and the direct detection experiments. We also discuss a shift of scalar trilinear coupling from the Standard Model prediction, which could be a test of this model in collider experiments.

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Gi-Chol Cho, Chikako Idegawa. 2024-10-18. Degenerate scalar scenario of two Higgs doublet model with a complex singlet scalar. https://arxiv.org/abs/2410.14328

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