Abstract
In this work, we study the future probes of the complex singlet extension to the Standard Model (cxSM). This model is possible to realize a strongly first-order electroweak phase transition (SFOEWPT). The cxSM naturally provides dark matter (DM) candidate, with or without an exact $\mathbb{Z}_2$ symmetry in the scalar sector. The benchmark models which can realize the SFOEWPT are selected, and passed to the current observational constraints to the DM candidates, including the relic densities and the direct detection limits set by the latest XENON1T results. We then calculate the one-loop corrections to the SM-like Higgs boson decays and the precision electroweak parameters due to the cxSM scalar sector. We perform a global fit to the benchmark models and study the extent to which they can be probed by the future high-energy $e^+ e^-$ colliders, such as CEPC and FCC-ee. Besides, the gravitational wave (GW) signals generated by the benchmark models are also evaluated. We further find that the future GW detector, such as LISA, is complementary in probing the benchmark models that are beyond the sensitivity of the future precision tests at the $e^+ e^-$ colliders.
Highlights
The observed baryon asymmetry of the Universe and the nature of dark matter (DM) are two of the leading puzzles that motivate the new physics beyond the standard model (SM)
We study the future probes of the complex singlet extension to the standard model
By combining the χ2 fit of the SM-like Higgs boson measurements and the electroweak precision measurements, we estimate whether the model points can be accessible at the future eþe− colliders
Summary
The observed baryon asymmetry of the Universe and the nature of dark matter (DM) are two of the leading puzzles that motivate the new physics beyond the standard model (SM). Under which only the real scalar is odd, this extension can provide a cold DM candidate since the discrete symmetry forbids the mixing between the neutral doublet and the real singlet This scenario admits a strongly firstorder and two-step phase transition in which the singlet scalar acquires a vacuum expectation value (VEV) before the electroweak symmetry breaking. With such incredible improvements in the precision measurements, a number of studies have been carried out to look for beyond the standard model effects through both tree-level and one-loop corrections to the productions [16,55,56,57] and decays [22,58,59,60,61] of the Higgs boson at the future eþe− colliders..
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