Electroweak baryogenesis from exotic electroweak symmetry breaking

Blinov, Nikita; Kozaczuk, Jonathan; Morrissey, David E.; Tamarit, Carlos

doi:10.1103/physrevd.92.035012

Cited by 99 publications

(104 citation statements)

References 155 publications

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“…Hypothetically, it is possible for electroweak symmetry to be broken, then restored, then broken again, or for electroweak symmetry breaking to proceed via a multi-step transition [30,[57][58][59][60][61]. In all cases, the relevant transition for electroweak baryogenesis is the one with the lowest critical temperature such that the metastable phase features φ h = 0, since this is the transition that shuts off the sphalerons for the last time.…”

Section: Jhep08(2017)096mentioning

confidence: 99%

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Chen

Kozaczuk

Lewis

2017

J. High Energ. Phys.

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107

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Abstract:We analyze the collider signatures of the real singlet extension of the Standard Model in regions consistent with a strong first-order electroweak phase transition and a singlet-like scalar heavier than the Standard Model-like Higgs. A definitive correlation exists between the strength of the phase transition and the trilinear coupling of the Higgs to two singlet-like scalars, and hence between the phase transition and non-resonant scalar pair production involving the singlet at colliders. We study the prospects for observing these processes at the LHC and a future 100 TeV pp collider, focusing particularly on double singlet production. We also discuss correlations between the strength of the electroweak phase transition and other observables at hadron and future lepton colliders. Searches for non-resonant singlet-like scalar pair production at 100 TeV would provide a sensitive probe of the electroweak phase transition in this model, complementing resonant di-Higgs searches and precision measurements. Our study illustrates a strategy for systematically exploring the phenomenologically viable parameter space of this model, which we hope will be useful for future work.

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Section: Jhep08(2017)096mentioning

confidence: 99%

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Chen

Kozaczuk

Lewis

2017

J. High Energ. Phys.

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107

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“…For these reasons, the IDM has been studied extensively as a model of dark matter (DM) [2,3], as a simple module to investigate deviations in the properties of the Higgs boson [2,4], and as a general source of new missing-energy signals in collider experiments [4,5]. Many other scenarios that postulate additional weakly-charged scalars can also be mapped onto (one or many copies of) the IDM [6,7,8,9,10,11,12,13], and the model can help to induce a strongly first-order electroweak phase transition suitable for electroweak baryogenesis [14,15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Compressing the inert doublet model

et al. 2016

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The Inert Doublet Model relies on a discrete symmetry to prevent couplings of the new scalars to Standard Model fermions. This stabilizes the lightest inert state, which can then contribute to the observed dark matter density. In the presence of additional approximate symmetries, the resulting spectrum of exotic scalars can be compressed. Here, we study the phenomenological and cosmological implications of this scenario. We derive new limits on the compressed Inert Doublet Model from LEP, and outline the prospects for exclusion and discovery of this model at dark matter experiments, the LHC, and future colliders.

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“…In other words, the Universe is in a supercooled state for some time. To calculate the nucleation temperatures T S and T n we used the publicly available CosmoTransitions package [23][24][25][26]. Note that since the effective potential is gauge dependent away from the minima, the calculated T n may have a residual gauge dependence, see e.g.…”

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confidence: 99%

Dark Matter Decay between Phase Transitions at the Weak Scale

Baker

Kopp

2017

Phys. Rev. Lett.

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We propose a new alternative to the Weakly Interacting Massive Particle (WIMP) paradigm for dark matter. Rather than being determined by thermal freeze-out, the dark matter abundance in this scenario is set by dark matter decay, which is allowed for a limited amount of time just before the electroweak phase transition. More specifically, we consider fermionic singlet dark matter particles coupled weakly to a scalar mediator S3 and to auxiliary dark sector fields, charged under the Standard Model gauge groups. Dark matter freezes out while still relativistic, so its abundance is initially very large. As the Universe cools down, the scalar mediator develops a vacuum expectation value (vev), which breaks the symmetry that stabilises dark matter. This allows dark matter to mix with charged fermions and decay. During this epoch, the dark matter abundance is reduced to give the value observed today. Later, the SM Higgs field also develops a vev, which feeds back into the S3 potential and restores the dark sector symmetry. In a concrete model we show that this "vev flip-flop" scenario is phenomenologically successful in the most interesting regions of its parameter space. We also comment on detection prospects at the LHC and elsewhere.The WIMP (Weakly Interacting Massive Particle) paradigm in dark matter physics states that dark matter (DM) particles should have non-negligible couplings to Standard Model (SM) particles. Their abundance today would then be determined by their abundance at freeze-out, the time when the temperature of the Universe dropped to the level where interactions producing and annihilating DM particles become inefficient. In many models these interactions should still be observable today, through residual DM annihilation in galaxies and galaxy clusters, through scattering of DM particles on atomic nuclei, or through DM production at colliders. The conspicuous absence of any convincing signals [1][2][3][4][5][6][7] to date motivates us to look for alternatives to the WIMP paradigm.In this letter, we present a scenario in which the DM abundance is set not by annihilation, but by decay. We focus on models in which fermionic DM particles couple to a new scalar species and argue that the resulting scalar potential may undergo multiple phase transitions, "flip-flopping" between phases in which the symmetry stabilising the DM is intact and a phase where it is broken. Similar behaviour is found in models of electroweak baryogenesis [8][9][10][11][12][13][14], see also [15] for related work. During the broken phase, the initially overabundant DM particles are depleted until their relic density reaches the value observed today. Although the resulting picture of early freeze out, followed by a period of DM decay around the weak scale, is quite generic, we focus here on a concrete example and comment on possible generalisations in the end.Model Framework.-We introduce a complex dark sector scalar S 3 that is a triplet under the SM SU (2) L gauge symmetry and carries zero hypercharge. We take the DM particle to...

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Electroweak baryogenesis from exotic electroweak symmetry breaking

Cited by 99 publications

References 155 publications

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Non-resonant collider signatures of a singlet-driven electroweak phase transition

Compressing the inert doublet model

Dark Matter Decay between Phase Transitions at the Weak Scale

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