Abstract
We study the Electroweak symmetry breaking mechanism with extra Electroweak symmetry breaking contributions (eEWSB) that are bounded by the Fermi constant and limits from the related collider searches. The eEWSB is helpful to build a different zero temperature vacuum structure from the Standard Model (SM), and therefore leads to different Electroweak phase transition patterns at the early Universe. We investigate the collider search prospects and gravitational waves (GW) predictions from the strongly firstly order phase transition (SFOEWPT) in this scenario. The Higgs pair searches at lepton colliders are found to be complementary with the GW searches of the SFOEWPT parameter spaces.
Highlights
The observation of the Standard Model (SM) Higgs at 126 GeV at LHC [1,2] is a milestone of the particle physics, which means that the W and Z bosons obtain their masses through the electroweak symmetry breaking (EWSB) mechanism
Utilizing the Georgi-Machacek model, we study the electroweak symmetry breaking mechanism with extra electroweak symmetry breaking contributions that are bounded by the Fermi constant and limits from the related collider searches
The observation of the SM Higgs at 126 GeV at LHC [1,2] is a milestone of the particle physics, which means that the W and Z bosons obtain their masses through the electroweak symmetry breaking (EWSB) mechanism
Summary
The observation of the SM Higgs at 126 GeV at LHC [1,2] is a milestone of the particle physics, which means that the W and Z bosons obtain their masses through the electroweak symmetry breaking (EWSB) mechanism. For previous studies of multistep phase transition and related vacuum structure at zero temperature, we refer to Refs. We use the Georgi-Machacek model to reveal that, the extra EWSB contribution can induce one-step or two-step SFOEWPT depending on the vacuum structure that has been studied previously by us in Ref [21]. In comparison with the one-step situation, the gravitational wave signal spectrum generated from two-step SFOEWPT is found much easier to be probed by the projected spacebased interferometers, such as: LISA [22], BBO, DECIGO (Ultimate-DECIGO) [23], TianQin [24] and Taiji [25] programs This is significantly different from the xSM case as was studied in Ref.
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