Leptogenesis and dark matter from a low scale seesaw mechanism

Liu, Ang; Han, Zhi-Long; Jin, Y.; Yang, F.

doi:10.1103/physrevd.101.095005

Cited by 19 publications

(16 citation statements)

References 71 publications

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“…The relation between these intriguing phenomena has been investigated in many works . One of the interesting possibilities is to connect the dark sector and the Standard Model through the RH neutrinos that realise the type I seesaw, which is usually named the neutrino portal scenario [104][105][106][107][108][109][110][111][112][113][114]. Some recent research [104][105][106] shows that dark matter particles can be dominantly produced through the neutrino Yukawa interactions in the seesaw sector non-thermally by the so-called "freeze-in" mechanism [115,116].…”

Section: Introductionmentioning

confidence: 99%

Dark matter in the type Ib seesaw model

Chianese

King

2021

J. High Energ. Phys.

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We consider a minimal type Ib seesaw model where the effective neutrino mass operator involves two different Higgs doublets, and the two right-handed neutrinos form a heavy Dirac mass. We propose a minimal dark matter extension of this model, in which the Dirac heavy neutrino is coupled to a dark Dirac fermion and a dark complex scalar field, both charged under a discrete Z2 symmetry, where the lighter of the two is a dark matter candidate. Focussing on the fermionic dark matter case, we explore the parameter space of the seesaw Yukawa couplings, the neutrino portal couplings and dark scalar to dark fermion mass ratio, where correct dark matter relic abundance can be produced by the freeze-in mechanism. By considering the mixing between the standard model neutrinos and the heavy neutrino, we build a connection between the dark matter production and current laboratory experiments ranging from collider to lepton flavour violating experiments. For a GeV mass heavy neutrino, the parameters related to dark matter production are constrained by the experimental results directly and can be further tested by future experiments such as SHiP.

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Section: Introductionmentioning

confidence: 99%

Dark matter in the type Ib seesaw model

Chianese

King

2021

J. High Energ. Phys.

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“…As the seesaw mechanism involves lepton number violation, it is commonly linked to leptogenesis [24][25][26][27][28][29][30][31][32][33][34] which provides an attractive and minimal origin of the baryon asymmetry in the Universe. Using the observed value of Baryon asymmetry [35], the seesaw parameters can be constrained and related to other cosmological problems like the dark matter [36][37][38][39][40][41][42]. However, standard leptogenesis can hardly be related to collider experiments, as there is a well-known lower bound of RH neutrino mass around 10 9 GeV [43].…”

Section: Contents 1 Introductionmentioning

confidence: 99%

Leptogenesis in Type Ib seesaw models

Fu¹,

King²

2021

Preprint

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We study leptogenesis in three different realisations of the type Ib seesaw mechanism, where the effective masses of the neutrinos are obtained by the spontaneous symmetry breaking of two different Higgs doublets. In the minimal type Ib seesaw model, where two right-handed neutrinos form a Dirac mass, we show that it is impossible to produce the correct baryon asymmetry, even including a pseudo-Dirac mass splitting. In an extended type Ib seesaw model, with a third very heavy Majorana right-handed neutrino, together with the low scale Dirac pair of right-handed (RH) neutrinos and an extra singlet Higgs boson, we find that the imbalance of matter and antimatter can be explained by resonant leptogenesis. In the resulting low scale effective type Ib seesaw mechanism, we derive the allowed range of the seesaw couplings consistent with resonant leptogenesis. Dark matter may also be included via the right-handed neutrino portal. The Dirac RH neutrino masses may lie in the 1-100 GeV mass range, accessible to the future experiments SHiP and FCC-ee, allowing the type Ib seesaw mechanism with leptogenesis and dark matter to be tested.

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“…Another great mystery unanswered by the SM is that of cosmological dark matter (DM), which is commonly thought to be some kind of massive new particle that is stable on cosmological timescales. Although many DM candidates have been proposed, the most common mechanism to account for their stability is to invent a discrete symmetry, the simplest example being Z 2 , under which the dark matter candidate is odd, while the SM particles are even, where such models may be related to neutrino mass and mixing [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Although this approach can explain the mystery of invisible dark matter, accounting for about a quarter of the energy density of the universe [40], the origin of the discrete symmetry such as Z 2 is rarely considered in the literature, but instead is often just imposed, for example as in the case of R-parity in supersymmetry (SUSY).…”

Section: Introductionmentioning

confidence: 99%

Spontaneously stabilised dark matter from a fermiophobic U(1)′ gauge symmetry

King

2021

J. High Energ. Phys.

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We consider the possibility that dark matter is stabilised by a discrete Z2 symmetry which arises from a subgroup of a U(1)′ gauge symmetry, spontaneously broken by integer charged scalars, and under which the chiral quarks and leptons do not carry any charges. A chiral fermion χ with half-integer charge is odd under the preserved Z2, and hence becomes a stable dark matter candidate, being produced through couplings to right-handed neutrinos with vector-like U(1)′ charges, as in the type Ib seesaw mechanism. We calculate the relic abundance in such a low energy effective seesaw model containing few parameters, then consider a high energy renormalisable model with a complete fourth family of vector-like fermions, where the chiral quark and lepton masses arise from a seesaw-like mechanism. With the inclusion of the fourth family, the lightest vector-like quark can contribute to the dark matter production, enlarging the allowed parameter space that we explore.

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Leptogenesis and dark matter from a low scale seesaw mechanism

Cited by 19 publications

References 71 publications

Dark matter in the type Ib seesaw model

Dark matter in the type Ib seesaw model

Leptogenesis in Type Ib seesaw models

Spontaneously stabilised dark matter from a fermiophobic U(1)′ gauge symmetry

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