scholarly journals Vacuum structure of the ℤ2 symmetric Georgi-Machacek model

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Duarte Azevedo ◽  
Pedro Ferreira ◽  
Heather E. Logan ◽  
Rui Santos
Keyword(s):  
Dark Matter ◽  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
The Other ◽  
Tree Level ◽  
Dark Matter Candidate ◽  
Symmetric Model ◽  
Electroweak Symmetry ◽  
Absolute Minimum ◽  
Vacuum Structure

Abstract We discuss the vacuum structure of a version of the Georgi-Machecek model with an exact ℤ2 symmetry acting on the triplet fields. Besides the usual custodial-symmetric model, with ρ = 1 at tree-level, a model with a dark matter candidate is also viable. The other phases of the model lead to electric charge breaking, a wrong pattern of electroweak symmetry breaking or to ρ ≠ 1 at tree-level. We derive conditions to have an absolute minimum in each of the two viable phases, the custodial and the dark matter phases.

scholarly journals Dark matter spectra from the electroweak to the Planck scale

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Christian W. Bauer ◽  
Nicholas L. Rodd ◽  
Bryan R. Webber
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Planck Scale ◽  
Electroweak Symmetry Breaking ◽  
Indirect Detection ◽  
Electroweak Symmetry ◽  
Stable States ◽  
Decay Spectrum ◽  
Crucial Ingredient

Abstract We compute the decay spectrum for dark matter (DM) with masses above the scale of electroweak symmetry breaking, all the way to the Planck scale. For an arbitrary hard process involving a decay to the unbroken standard model, we determine the prompt distribution of stable states including photons, neutrinos, positrons, and antiprotons. These spectra are a crucial ingredient in the search for DM via indirect detection at the highest energies as being probed in current and upcoming experiments including IceCube, HAWC, CTA, and LHAASO. Our approach improves considerably on existing methods, for instance, we include all relevant electroweak interactions.

scholarly journals Constraining the gauge and scalar sectors of the doublet left-right symmetric model

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Véronique Bernard ◽  
Sébastien Descotes-Genon ◽  
Luiz Vale Silva
Keyword(s):  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Symmetric Model ◽  
Electroweak Symmetry ◽  
Gauge Bosons ◽  
Spontaneous Breakdown ◽  
The Standard Model ◽  
Low Energies ◽  
Precision Observables ◽  
Electroweak Precision

Abstract We consider a left-right symmetric extension of the Standard Model where the spontaneous breakdown of the left-right symmetry is triggered by doublets. The electroweak ρ parameter is protected from large corrections in this Doublet Left-Right Model (DLRM), contrary to the triplet case. This allows in principle for more diverse patterns of symmetry breaking. We consider several constraints on the gauge and scalar sectors of DLRM: the unitarity of scattering processes involving gauge bosons with longitudinal polarisations, the radiative corrections to the muon ∆r parameter and the electroweak precision observables measured at the Z pole and at low energies. Combining these constraints within the frequentist CKMfitter approach, we see that the fit pushes the scale of left-right symmetry breaking up to a few TeV, while favouring an electroweak symmetry breaking triggered not only by the SU(2)L×SU(2)R bi-doublet, which is the case most commonly considered in the literature, but also by the SU(2)L doublet.

scholarly journals A GENERAL HIGGS SECTOR: CONSTRAINTS AND PHENOMENOLOGY

1996 ◽  
Vol 11 (29) ◽  
pp. 5221-5243 ◽  
Author(s):  
ANIRBAN KUNDU ◽  
BISWARUP MUKHOPADHYAYA
Keyword(s):  
Symmetry Breaking ◽  
Precision Measurement ◽  
General Structure ◽  
Higgs Sector ◽  
Electroweak Symmetry Breaking ◽  
Higgs Bosons ◽  
Tree Level ◽  
Electroweak Symmetry ◽  
Interaction Terms ◽  
Scalar Sector

We have investigated some phenomenological aspects of an SU (2) × U (1) scenario where scalars belonging to arbitrary representations of SU(2) are involved in electroweak symmetry breaking. The resulting interaction terms are derived. Some constraints are obtained on the arbitrary scalar sector from the requirement of tree-level unitarity in longitudinal gauge boson scattering. We also show that there is a remarkable complimentarity between the constraints on a general structure from the ρ parameter and those from precision measurement of the [Formula: see text] vertex. Finally, some salient features about the production of such Higgs bosons in e+e− collision are discussed.

scholarly journals Towards completing the standard model: Vacuum stability, electroweak symmetry breaking, and dark matter

2014 ◽  
Vol 89 (1) ◽  
Author(s):  
Emidio Gabrielli ◽  
Matti Heikinheimo ◽  
Kristjan Kannike ◽  
Antonio Racioppi ◽  
Martti Raidal ◽  
...  
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Vacuum Stability ◽  
The Standard Model

scholarly journals Electroweak symmetry breaking induced by dark matter

2008 ◽  
Vol 659 (3) ◽  
pp. 651-655 ◽  
Author(s):  
Thomas Hambye ◽  
Michel H.G. Tytgat
Keyword(s):  
Dark Matter ◽  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry

scholarly journals Can dark matter drive electroweak symmetry breaking?

2020 ◽  
Vol 102 (6) ◽  
Author(s):  
Catarina Cosme ◽  
João G. Rosa ◽  
O. Bertolami
Keyword(s):  
Dark Matter ◽  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry

On the Possible Links Between Electroweak Symmetry Breaking and Dark Matter

2009 ◽  
Author(s):  
Thomas Hambye ◽  
Michel H. G. Tytgat ◽  
Shaaban Khalil
Keyword(s):  
Dark Matter ◽  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry
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