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A complex singlet extension of the Standard Model and Multi-critical Point Principle

Gi-Chol ChoChikako IdegawaRio Sugihara
Dec 2022
摘要
We study the Multi-critical Point Principle (MPP) in a complex singlet scalarextension of the Standard Model (CxSM). The MPP discussed in this study selectsmodel parameters so that two low-energy vacua realized by scalar fields aredegenerate. We further note that the MPP may inhibit the electroweak phasetransition (EWPT) in a certain class of models where the tree-level potentialplays an essential role in its realization. Despite that, we show that strongfirst-order EWPT still occurs even after imposing the MPP to the scalarpotential of the CxSM due to the 1-loop corrections by the new scalar boson. Westudy the allowed parameter space where a mass of the additional scalar isdegenerate with that of the Standard Model Higgs boson, which provides abuilt-in mechanism to circumvent constraints from dark matter direct detectionexperiments. The parameter space for the non-degenerate scalar scenario is alsostudied for comparison.
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