Electroweak phase transition in an extension of the standard model with a real Higgs singlet

Abstract

The Higgs potential of the standard model with an additional real Higgs singlet is studied in order to examine if it may allow the strongly first order electroweak phase transition. It is found that there are parameter values for which this model at the one-loop level with finite temperature effect may allow the desired phase transition. Those parameter values also predict that the masses of the neutral scalar Higgs bosons of the model are consistent with the present experimental bound, and that their productions in $e^{+}{e}^{-}$ collisions may be searched at the proposed ILC with $\sqrt{s}$ = 500 GeV in the near future.

25 pages, 12 figures

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