Electroweak phase transition in Georgi–Machacek model

Chiang, Cheng‐Wei; Yamada, Toshifumi

doi:10.1016/j.physletb.2014.06.048

Cited by 41 publications

(23 citation statements)

References 22 publications

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“…Moreover, we examine how the new particles, which we choose to have sub-TeV masses, may give rise to strongly first-order electroweak phase transition (EWPT), which is needed for electroweak baryogenesis to explain the baryon asymmetry of the Universe. As it has been pointed out in the context of other models that the strength of EWPT could be correlated with sizable modifications to the Higgs trilinear self-coupling [15][16][17][18][19], our results will indicate how this may be realized in the presence of the new doublets. Due to their tree-level interactions with SM gauge and Higgs bosons, the lightest of the inert scalars cannot serve as good candidates for DM, as they annihilate into SM particles too fast and hence cannot produce enough relic abundance.…”

Section: Introductionsupporting

confidence: 65%

Effects of two inert scalar doublets on Higgs boson interactions and the electroweak phase transition

Ahriche

Faisel

et al. 2015

Phys. Rev. D

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We study some implications of the presence of two new scalar weak doublets beyond the standard model which have zero vacuum expectation values and are charged under an extra Abelian gauge symmetry. The additional gauge sector does not couple directly to standard-model particles. We investigate specifically the effects of the scalars on oblique electroweak parameters and on the interactions of the 125 GeV Higgs boson, especially its decay modes h → γγ; γZ and trilinear self-coupling, all of which will be probed with improved precision in future Higgs measurements. Moreover, we explore how the new scalars may give rise to strongly first-order electroweak phase transition and also show its correlation with sizable modifications to the Higgs trilinear self-coupling.

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Section: Introductionsupporting

confidence: 65%

Effects of two inert scalar doublets on Higgs boson interactions and the electroweak phase transition

Ahriche

Faisel

et al. 2015

Phys. Rev. D

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“…We considered production through VBF, V H 5 , and H 5 H 5 associated production at the benchmark point of Eq. (22). Our results demonstrate the importance of a fully differential simulation at NLO+PS in order to accurately simulate the signal at the LHC.…”

Section: Discussionmentioning

confidence: 62%

Automatic predictions in the Georgi-Machacek model at next-to-leading order accuracy

et al. 2016

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We study the phenomenology of the Georgi-Machacek model at next-to-leading order (NLO) in QCD matched to parton shower, using a fully-automated tool chain based on MadGraph5 aMC@NLO and FeynRules. We focus on the production of the fermiophobic custodial fiveplet scalars H through vector boson fusion (VBF), associated production with a vector boson (V H5), and scalar pair production (H5H5). For these production mechanisms we compute NLO corrections to production rates as well as to differential distributions. Our results demonstrate that the Standard Model (SM) overall K-factors for such processes cannot in general be directly applied to beyond-the-SM distributions, due both to differences in the scalar electroweak charges and to variation of the K-factors over the differential distributions.

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“…Various extensions of the GM model has been studied including supersymmetric version [13], with fields higher than the triplet representation [14], the one incorporating an extra singlet to address the dark matter [15], etc. It was also shown that the strong first order electroweak phase transition, which is necessary for the successful electroweak baryogenesis, could be achieved depending on the parameter choice [16].…”

Section: Introductionmentioning

confidence: 99%

Topological defects in the Georgi-Machacek model

Chatterjee¹,

Kurachi

Nitta³

2018

Phys. Rev. D

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We study topological defects in the Georgi-Machacek model in a hierarchical symmetry breaking in which extra triplets acquire vacuum expectation values before the doublet. We find a possibility of topologically stable non-Abelian domain walls and non-Abelian flux tubes (vortices) in this model. In the limit of the vanishing U (1) Y gauge coupling in which the custodial symmetry becomes exact, the presence of a vortex spontaneously breaks the custodial symmetry, giving rise to S 2 Nambu-Goldstone (NG) modes localized around the vortex corresponding to non-Abelian fluxes. Vortices are continuously degenerated by these degrees of freedom, thereby called non-Abelian. By taking into account the U (1) Y gauge coupling, the custodial symmetry is explicitly broken, the NG modes are lifted, and all non-Abelian vortices fall into a topologically stable Z-string. This is in contrast to the SM in which Z-strings are non-topological and are unstable in the realistic parameter region. Non-Abelian domain walls also break the custodial symmetry and are accompanied by localized S 2 NG modes. Finally, we discuss the existence of domain wall solutions bounded by flux tubes, where their S 2 NG modes match. The domain walls may quantum mechanically decay by creating a hole bounded by a flux tube loop, and would be cosmologically safe. Gravitational waves produced from unstable domain walls could be detected by future experiments.

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Electroweak phase transition in Georgi–Machacek model

Cited by 41 publications

References 22 publications

Effects of two inert scalar doublets on Higgs boson interactions and the electroweak phase transition

Effects of two inert scalar doublets on Higgs boson interactions and the electroweak phase transition

Automatic predictions in the Georgi-Machacek model at next-to-leading order accuracy

Topological defects in the Georgi-Machacek model

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