Higgs-like boson at 750 GeV and genesis of baryons

Davoudiasl, Hooman; Giardino, Pier Paolo; Zhang, Cen

doi:10.1103/physrevd.94.015006

Cited by 5 publications

(13 citation statements)

References 34 publications

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“…Ref. [54] also mentions a possibility to use an extra SU(2) gauge symmetry for baryogenesis, although the amount of the produced baryon asymmetry is not estimated and it is not clear if their setup actually works. If the electroweak scale is naturally obtained by some dynamics, it is plausible that the higher scale is determined by the same dynamics and not far above the electroweak scale.…”

Section: Introductionmentioning

confidence: 99%

Electroweak-like baryogenesis with new chiral matter

Fujikura

Harigaya

Nakai

et al. 2021

J. High Energ. Phys.

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We propose a framework where a phase transition associated with a gauge symmetry breaking that occurs (not far) above the electroweak scale sets a stage for baryogenesis similar to the electroweak baryogenesis in the Standard Model. A concrete realization utilizes the breaking of SU(2)R× U(1)X→ U(1)Y. New chiral fermions charged under the extended gauge symmetry have nonzero lepton numbers, which makes the B − L symmetry anomalous. The new lepton sector contains a large flavor-dependent CP violation, similar to the Cabibbo-Kobayashi-Maskawa phase, without inducing sizable electric dipole moments of the Standard Model particles. A bubble wall dynamics associated with the first-order phase transition and SU(2)R sphaleron processes generate a lepton asymmetry, which is transferred into a baryon asymmetry via the ordinary electroweak sphaleron process. Unlike the Standard Model electroweak baryogenesis, the new phase transition can be of the strong first order and the new CP violation is not significantly suppressed by Yukawa couplings, so that the observed asymmetry can be produced. The model can be probed by collider searches for new particles and the observation of gravitational waves. One of the new leptons becomes a dark matter candidate. The model can be also embedded into a left-right symmetric theory to solve the strong CP problem.

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Section: Introductionmentioning

confidence: 99%

Electroweak-like baryogenesis with new chiral matter

Fujikura

Harigaya

Nakai

et al. 2021

J. High Energ. Phys.

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show abstract

“…The model is an extension of the one presented in Ref. [1], with the addition of a complex scalar χ, that carries a conserved global charge Q χ . Requiring that χ is lighter than all the other particles carrying Q χ , we ensure that χ is a stable particle and a good asymmetric DM candidate.…”

Section: Discussionmentioning

confidence: 99%

“…The exo-Higgs model was introduced in detail in Ref. [1]. Here, we only review its main ingredients and features that will be relevant to this work.…”

Section: A Minimal Extension Of the Exo-higgs Modelmentioning

confidence: 99%

“…(15) to ensure that the phase transition is strongly first order, namely 3g 3 e /(16πλ η ) 1 where λ η is the coefficient of the quartic term (η † η) 2 ; see Ref. [1] for a discussion of a first order phase transition in the exo-Higgs scenario and Ref. [16] for details.…”

Section: Lhc Phenomenologymentioning

confidence: 99%

“…As shown in Ref. [1], Ϙ's can be looked for in standard vector-like quark searches at LHC (see for example Ref. [17]).…”

Section: Lhc Phenomenologymentioning

confidence: 99%

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Asymmetric dark matter in extended exo-Higgs scenarios

2017

Self Cite

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The exo-Higgs model can accommodate a successful baryogenesis mechanism that closely mirrors electroweak baryogenesis in the Standard Model, but avoids its shortcomings. We extend the exo-Higgs model by the addition of a singlet complex scalar χ. In our model, χ can be a viable asymmetric dark matter (ADM) candidate. We predict the mass of the ADM particle to be mχ ≈ 1.3 GeV. The leptophilic couplings of χ can provide for efficient annihilation of the ADM pairs. We also discuss the LHC signals of our scenario, and in particular the production and decays of exo-leptons which would lead to "lepton pair plus missing energy" final states. Our model typically predicts potentially detectable gravitational waves originating from the assumed strong first order phase transition at a temperature of ∼ TeV. If the model is further extended to include new heavy vector-like fermions, e.g. from an ultraviolet extension, χ couplings could explain the ∼ 3.5σ muon g − 2 anomaly. *

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Baryogenesis in a parity solution to the strong CP problem

Harigaya,

Wang

2023

J. High Energ. Phys.

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Space-time parity can solve the strong CP problem and introduces a spontaneously broken SU(2)R gauge symmetry. We investigate the possibility of baryogenesis from a first-order SU(2)R phase transition similar to electroweak baryogenesis. We consider a model with the minimal Higgs content, for which the strong CP problem is indeed solved without introducing extra symmetry beyond parity. Although the parity symmetry seems to forbid the SU(2)R anomaly of the B − L symmetry, the structure of the fermion masses can allow for the SU(2)R sphaleron process to produce non-zero B − L asymmetry of Standard Model particles so that the wash out by the SU(2)L sphaleron process is avoided. The setup predicts a new hyper-charged fermion whose mass is correlated with the SU(2)R symmetry breaking scale and hence with the SU(2)R gauge boson mass, and depending on the origin of CP violation, with an electron electric dipole moment. In a setup where CP violation and the first-order phase transition are assisted by a singlet scalar field, the singlet can be searched for at future colliders.

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Higgs-like boson at 750 GeV and genesis of baryons

Cited by 5 publications

References 34 publications

Electroweak-like baryogenesis with new chiral matter

Electroweak-like baryogenesis with new chiral matter

Asymmetric dark matter in extended exo-Higgs scenarios

Baryogenesis in a parity solution to the strong CP problem

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