Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars

We study the feasibility of strong first-order electroweak phase transition (EWPT) in a degenerate-scalar scenario of a complex singlet extension of the Standard Model, in which a mass of an additional scalar is nearly degenerate with that of the Higgs boson, 125 GeV. This scenario is known to provi...

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Autores principales:	Gi-Chol Cho, Chikako Idegawa, Eibun Senaha
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/f325d2421d4042878e035a8de3f988e4
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spelling	oai:doaj.org-article:f325d2421d4042878e035a8de3f988e42021-12-04T04:32:46ZElectroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars0370-269310.1016/j.physletb.2021.136787https://doaj.org/article/f325d2421d4042878e035a8de3f988e42021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0370269321007279https://doaj.org/toc/0370-2693We study the feasibility of strong first-order electroweak phase transition (EWPT) in a degenerate-scalar scenario of a complex singlet extension of the Standard Model, in which a mass of an additional scalar is nearly degenerate with that of the Higgs boson, 125 GeV. This scenario is known to provide an exquisite solution for circumventing constraints from dark matter direct detection experiments due to cancellations between two scattering amplitudes mediated by two scalars. In the analysis of EWPT, we employ two gauge-invariant calculation schemes on the scalar potential and two familiar resummation methods in evaluating one-loop (gauge dependent) effective potential. We point out that one of the conditions for the strong first-order EWPT is incompatible with the known suppression mechanism of a dark matter cross-section scattering off the nucleons. Nevertheless, we find that strong first-order EWPT is still possible in the degenerate-scalar scenario by dodging dark matter constraints differently.Gi-Chol ChoChikako IdegawaEibun SenahaElsevierarticlePhysicsQC1-999ENPhysics Letters B, Vol 823, Iss , Pp 136787- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Gi-Chol Cho Chikako Idegawa Eibun Senaha Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars
description	We study the feasibility of strong first-order electroweak phase transition (EWPT) in a degenerate-scalar scenario of a complex singlet extension of the Standard Model, in which a mass of an additional scalar is nearly degenerate with that of the Higgs boson, 125 GeV. This scenario is known to provide an exquisite solution for circumventing constraints from dark matter direct detection experiments due to cancellations between two scattering amplitudes mediated by two scalars. In the analysis of EWPT, we employ two gauge-invariant calculation schemes on the scalar potential and two familiar resummation methods in evaluating one-loop (gauge dependent) effective potential. We point out that one of the conditions for the strong first-order EWPT is incompatible with the known suppression mechanism of a dark matter cross-section scattering off the nucleons. Nevertheless, we find that strong first-order EWPT is still possible in the degenerate-scalar scenario by dodging dark matter constraints differently.
format	article
author	Gi-Chol Cho Chikako Idegawa Eibun Senaha
author_facet	Gi-Chol Cho Chikako Idegawa Eibun Senaha
author_sort	Gi-Chol Cho
title	Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars
title_short	Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars
title_full	Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars
title_fullStr	Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars
title_full_unstemmed	Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars
title_sort	electroweak phase transition in a complex singlet extension of the standard model with degenerate scalars
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/f325d2421d4042878e035a8de3f988e4
work_keys_str_mv	AT gicholcho electroweakphasetransitioninacomplexsingletextensionofthestandardmodelwithdegeneratescalars AT chikakoidegawa electroweakphasetransitioninacomplexsingletextensionofthestandardmodelwithdegeneratescalars AT eibunsenaha electroweakphasetransitioninacomplexsingletextensionofthestandardmodelwithdegeneratescalars
_version_	1718373065397633024

Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars

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