What is the Criterion for a Strong First Order Electroweak Phase Transition in Singlet Models?

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dc.creatorAhriche, Amine
dc.date2007-01-23
dc.date2007-04-19
dc.date.accessioned2026-07-07T10:37:48Z
dc.date.available2026-07-07T10:37:48Z
dc.descriptionIt is widely believed that the existence of singlet scalars in some Standard Model extensions can easily make the electroweak phase transition strongly first order, which is needed for the electroweak baryogenesis scenario. In this paper, we will examine the strength of the electroweak phase transition in the simplest extension of the Standard Model with a real singlet using the sphaleron energy at the critical temperature. We find that the phase transition is stronger by adding a singlet; and also that the criterion for a strong phase transition Omega (Tc)/Tc>1, where Omega =(v^2+(x-x0)^2)^(1/2) and x (x0) is the singlet vev in the broken (symmetric) phase, is not valid for models containing singlets, even though often used in the literature. The usual condition vc/Tc>1 is more meaningful, and it is satisfied for a large part of the parameter space for physically allowed Higgs masses.
dc.description9 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0701192
dc.identifierhttp://arxiv.org/abs/hep-ph/0701192
dc.identifierPhys.Rev.D75:083522,2007
dc.identifierdoi:10.1103/PhysRevD.75.083522
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180500
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleWhat is the Criterion for a Strong First Order Electroweak Phase Transition in Singlet Models?
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