Vacuum structure and stability of a singlet fermion dark matter model with a singlet scalar messenger

A bstract We consider the issue of vacuum stability and triviality bound of the singlet extension of the Standard Model (SM) with a singlet fermion dark matter (DM). In this model, the singlet scalar plays the role of a messenger between the SM sector and the dark matter sector. This model has two H...

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Bibliographic Details
Published in:The journal of high energy physics 2012-11, Vol.2012 (11), Article 116
Main Authors: Baek, Seungwon, Ko, P., Park, Wan-Il, Senaha, Eibun
Format: Article
Language:English
Subjects:
Bosons
Classical and Quantum Gravitation
Constraint modelling
Couplings
Dark matter
Electroweak model
Elementary Particles
Fermions
Higgs bosons
High energy physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Relativity Theory
String Theory
Structural stability
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Summary:A bstract We consider the issue of vacuum stability and triviality bound of the singlet extension of the Standard Model (SM) with a singlet fermion dark matter (DM). In this model, the singlet scalar plays the role of a messenger between the SM sector and the dark matter sector. This model has two Higgs-like scalar bosons, and is consistent with all the data on electroweak precision tests, thermal relic density of DM and its direct detection constraints. We show that this model is stable without hitting Landau pole up to Planck scale for 125 GeV Higgs boson. We also perform a comprehensive study of vacuum structure, and point out that a region where electroweak vacuum is the global minimum is highly limited. In this model, both Higgs-like scalar bosons have reduced couplings to the SM weak gauge bosons and the SM fermions, because of the mixing between the SM Higgs boson and the singlet scalar. There is also a possibility of their invisible decay(s) into a pair of DM’s. Therefore this model would be disfavored if the future data on the ( σ B ) VV or with V = γ , W, Z and f = b, τ turn out larger than the SM predictions.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP11(2012)116