Scalar Triplet Leptogenesis with a CP violating phase

Sreerupa, Chongdar,; Mishra, Sasmita

doi:10.48550/arxiv.2112.11838

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…Since we have introduced Another important but unaddressed subject is baryogenesis, which is beyond the scope of this paper. We, here, note that thermal leptogenesis by heavy triplet Higgs particles [79][80][81][82] or Affelck-Dine baryogenesis by scalar condensations [83] appears to be promising.…”

Section: Discussionmentioning

confidence: 81%

Dirac dark matter, dark radiation and type-II seesaw in alternative $U(1)_X$ standard model

Okada,

Seto

2022

Preprint

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We propose an extra U (1) X model with an alternative charge assignment for right-handed (RH) neutrinos. The type-II seesaw mechanism by a triplet Higgs field is promising for neutrino mass generation because of the alternative charge assignment. The small vacuum expectation value (VEV) of an additional Higgs doublet naturally leads to a very small VEV of the triplet Higgs field, and as a result, the smallness of neutrino mass can be understood. With the minimal Higgs field for U (1) X with the charge 1, RH neutrinos are candidates for Dirac dark matter (DM) and dark radiation (DR). We have derived and imposed the LHC bound, the DR constraint and the bound from DM direct searches in the wide range of parameter space. Among various U (1) X choices, the DM direct search bound is found to be weakest for U (1) R where the constraints from thermal DM and non-negligible DR can be compatible. Such a number of the effective neutrino species would be interesting from the viewpoint of the so-called Hubble tension.

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Section: Discussionmentioning

confidence: 81%

Dirac dark matter, dark radiation and type-II seesaw in alternative $U(1)_X$ standard model

Okada,

Seto

2022

Preprint

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“…In addition to the neutral component, the charged components of the triplet Higgs, ∆ + and ∆ ++ , play an important role at terrestrial collider experiments. Their phenomenological implications will be integral to the discovery of the Type II Seesaw Mechanism and the determination of its properties [57][58][59][60][61][62][63].…”

Section: Jhep05(2022)160mentioning

confidence: 99%

Type II Seesaw leptogenesis

Barrie

Han

Murayama

2022

J. High Energ. Phys.

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The Type II Seesaw Mechanism provides a minimal framework to explain the neutrino masses involving the introduction of a single triplet Higgs to the Standard Model. However, this simple extension was believed to be unable to successfully explain the observed baryon asymmetry of the universe through Leptogenesis. In our previous work (Phys. Rev. Lett.128 (2022) 141801), we demonstrated that the triplet Higgs of the Type II Seesaw Mechanism alone can simultaneously generate the observed baryon asymmetry of the universe and the neutrino masses while playing a role in setting up Inflation. This is achievable with a triplet Higgs mass as low as 1 TeV, and predicts that the neutral component obtains a small vacuum expectation value v∆< 10 keV. We find that our model has very rich phenomenology and can be tested by various terrestrial experiments as well as by astronomical observations. Particularly, we show that the successful parameter region may be probed at a future 100 TeV collider, upcoming lepton flavor violation experiments such as Mu3e, and neutrinoless double beta decay experiments. Additionally, the tensor-to-scalar ratio from the inflationary scenario will be probed by the LiteBIRD telescope, and observable isocurvature perturbations may be produced for some parameter choices. In this article, we present all the technical details of our calculations and further discussion of its phenomenological implications.

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Scalar Triplet Leptogenesis with a CP violating phase

Cited by 2 publications

References 34 publications

Dirac dark matter, dark radiation and type-II seesaw in alternative $U(1)_X$ standard model

Dirac dark matter, dark radiation and type-II seesaw in alternative $U(1)_X$ standard model

Type II Seesaw leptogenesis

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