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.

19 pages, 3 figures

References in corpus (8)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Observation of the diphoton decay of the Higgs boson and measurement of its properties
• Electroweak phase transition, critical bubbles and sphaleron decoupling condition in the MSSM
• Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production
• Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars
• Principle of Multiple Point Criticality in Multi-Scalar Dark Matter Models
• One-loop Corrections to the Higgs Boson Invisible Decay in a Complex Singlet Extension of the SM

Cited by in corpus (8)

• Resonant Multi-Scalar Production in the Generic Complex Singlet Model in the Multi-TeV Region
• Charged Higgs decay to $W^{\pm }H$ at a high energy lepton collider
• Principle of multi-critical-points in the ALP-Higgs model and the corresponding phase transition
• Heavy neutral 2HDM Higgs Boson Pair Production at CLIC Energies
• Prediction of the Dark Fermion Mass using Multicritical-Point Principle
• On the Effects of Elementary and Bound State Fields on Vacuum Stability in $t\bar{t}$ Production at the LHC
• Primordial Black Hole Formation and Multimessenger Signals in a Complex Singlet Extension of the Standard Model
• Possible mixing between elementary and bound state fields in the $t\bar{t}$ production excess at the LHC