A complex singlet extension of the Standard Model and Multi-critical Point Principle
Abstract
We study the Multi-critical Point Principle (MPP) in a complex singlet scalar extension of the Standard Model (CxSM). The MPP discussed in this study selects model parameters so that two low-energy vacua realized by scalar fields are degenerate. We further note that the MPP may inhibit the electroweak phase transition (EWPT) in a certain class of models where the tree-level potential plays an essential role in its realization. Despite that, we show that strong first-order EWPT still occurs even after imposing the MPP to the scalar potential of the CxSM due to the 1-loop corrections by the new scalar boson. We study the allowed parameter space where a mass of the additional scalar is degenerate with that of the Standard Model Higgs boson, which provides a built-in mechanism to circumvent constraints from dark matter direct detection experiments. The parameter space for the non-degenerate scalar scenario is also studied for comparison.
Keywords
Cite
@article{arxiv.2212.13029,
title = {A complex singlet extension of the Standard Model and Multi-critical Point Principle},
author = {Gi-Chol Cho and Chikako Idegawa and Rio Sugihara},
journal= {arXiv preprint arXiv:2212.13029},
year = {2023}
}
Comments
19 pages, 3 figures