Baryogenesis via leptogenesis from asymmetric dark matter and radiatively generated neutrino mass

Narendra, Nimmala; Patra, Sudhanwa; Sahu, Narendra; Shil, Sujay

doi:10.1103/physrevd.98.095016

“…Finally asymmetric components of the SM and dark sector lepton asymmetries would be converted into baryon asymmetry and DM number density respectively. This scenario is different from the standard asymmetric dark matter (ADM) [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] scenario where the asymmetry is generated in one sector and then it is transferred to the other sector. Different models of ADM simultaneously generating visible sector and dark sector asymmetry have been explored extensively [64][65][66][67][68][69][70][71][72].…”

Section: Jcap03(2021)037mentioning

confidence: 93%

Neutrino mass and asymmetric dark matter: study with inert Higgs doublet and high scale validity

Banik

¹

,

Roshan

²

,

Sil

³

2021

J. Cosmol. Astropart. Phys.

13

0

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We consider an inert Higgs doublet (IHD) extension of the Standard Model accompanied with three right handed neutrinos and a dark sector, consisting of a singlet fermion and a scalar, in order to provide a common framework for dark matter, leptognesis and neutrino mass. While the Yukawa coupling of the right handed neutrinos with IHD (having mass in the intermediate regime: 80–500 GeV) is responsible for explaining the observed baryon asymmetry through leptogenesis, its coupling with the dark sector explains the dark matter relic density. The presence of IHD also explains the neutrino mass through radiative correction. We find that study of the high scale validity of the model in this context becomes crucial as it restricts the parameter space significantly. It turns out that there exists a small, but non-zero contribution to the relic density of DM from IHD too. Considering all the constraints from dark matter, leptogenesis, neutrino mass and high scale validity of the model, we perform a study to find out the viable parameter space.

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“…In order to have successful leptogenesis, in Type-I and Type-II seesaw extensions, the heavy singlet fermion and scalar triplet, respectively, contribute to the overall lepton asymmetry which further can be converted to baryon asymmetry via sphaleron processes [7][8][9][10][11][12][13][14][15]. The phenomena of leptogenesis in various extensions of the SM has been discussed thoroughly in the literature [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The standard thermal leptogenesis based on Type-I seesaw model has a limitation of requiring very heavy Majorana fermions [36][37][38][39].…”

Section: Jcap02(2024)041mentioning

confidence: 99%

Low scale leptogenesis in singlet-triplet scotogenic model

Singh,

Mahanta,

Verma

2024

J. Cosmol. Astropart. Phys.

0

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The scotogenic model presents an elegant and succinct framework for elucidating the origin of tiny neutrino masses within the framework of the Standard Model, employing radiative corrections within the domain of the dark sector. We investigate the possibility of achieving low-scale leptogenesis in the singlet-triplet scotogenic model (STSM), where dark matter mediates neutrino mass generation. We initially considered a scenario involving two moderately hierarchical heavy fermions, N and Σ, wherein the lepton asymmetry is generated by the out-of-equilibrium decay of both particles. Our analysis indicates that the scale of leptogenesis in this scenario is similar to that of standard thermal leptogenesis and is approximately M N,Σ ∼ 109 GeV, which is comparable to the Type-I seesaw case. Further, we consider the case with three heavy fermions (N 2, N 2, and Σ) with the hierarchy M N 1 < M Σ ≪ MM N 2 , which yields the lower bound on heavy fermions up to 3.1 TeV, therefore significantly reduce the scale of the leptogenesis up to TeV scale. The only prerequisite is suppression in the N 1 and Σ Yukawa couplings, which causes suppressed washout effects and a small active neutrino mass of about 10-5 eV. This brings about the fascinating insight that experiments aiming to measure the absolute neutrino mass scale can test low-scale leptogenesis in the scotogenic model. Further, the hyperchargeless scalar triplet Ω provides an additional contribution to mass of the W-boson explaining CDF-II result.

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“…where we assume M 1 M 2 . As a result, below the mass scale of ξ 1 , we get a net B − L asymmetry [121][122][123][124]:…”

Section: Triplet Scalar Leptogenesis and Asymmetric Dmmentioning

confidence: 99%

“…, h 2 refer to [124]. The thermal averaged annihilation cross-section of χχ → f f is then given by [129]: (44) where K 1 and K 2 are modified Bessel functions of first and second kind respectively and T is the temperature of thermal bath.…”

Section: Depletion Of Symmetric Component Of the Dmmentioning

confidence: 99%

See 1 more Smart Citation

Dark matter to baryon ratio from scalar triplets decay in type-II seesaw

Narendra

¹

,

Sahu

²

,

Shil

³

2021

Eur. Phys. J. C

Self Cite

2

0

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We propose a minimal model for the cosmic coincidence problem $$\Omega _\mathrm{DM}/\Omega _B \sim 5$$ Ω DM / Ω B ∼ 5 and neutrino mass in a type-II seesaw scenario. We extend the standard model of particle physics with a $$\mathrm SU(2)$$ S U ( 2 ) singlet leptonic Dirac fermion $$\chi $$ χ , which represents the candidate of dark matter (DM), and two triplet scalars $$\Delta _{1,2}$$ Δ 1 , 2 with hierarchical masses. In the early Universe, the CP violating out-of-equilibrium decay of lightest $$\Delta $$ Δ generates a net $$B-L$$ B - L asymmetry in the visible sector (comprising of SM fields), where B and L represents the total baryon and lepton number respectively. A part of this asymmetry gets transferred to the dark sector (comprising of DM $$\chi $$ χ ) through a dimension eight operator which conserves $$B-L$$ B - L . Above the electroweak phase transition, the $$B-L$$ B - L asymmetry of the visible sector gets converted to a net B-asymmetry by the $$B+L$$ B + L violating sphalerons, while the $$B-L$$ B - L asymmetry of the dark sector remains untouched which we see today as relics of DM. We show that the observed DM abundance can be explained for a DM mass about 8 GeV. We then introduce an additional singlet scalar field $$\phi $$ ϕ which mixes with the SM-Higgs to annihilate the symmetric component of the DM resonantly which requires the singlet scalar mass to be twice the DM mass, i.e. around 16 GeV, which can be searched at collider experiments. In our model, the active neutrinos also get small masses by the induced vacuum expectation value (vev) of the triplet scalars $$\Delta _{1,2}$$ Δ 1 , 2 . In the later part of the paper we discuss all the constraints on model parameters coming from invisible Higgs decay, Higgs signal strength, DM direct detection and relic density of DM.

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Baryogenesis via leptogenesis from asymmetric dark matter and radiatively generated neutrino mass

Cited by 6 publications

References 116 publications

Neutrino mass and asymmetric dark matter: study with inert Higgs doublet and high scale validity

Neutrino mass and asymmetric dark matter: study with inert Higgs doublet and high scale validity

Low scale leptogenesis in singlet-triplet scotogenic model

Dark matter to baryon ratio from scalar triplets decay in type-II seesaw

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