Mini Review on Vector-Like Leptonic Dark Matter, Neutrino Mass, and Collider Signatures

Bhattacharya, Subhaditya; Ghosh, Purusottam; Sahoo, Nirakar; Sahu, Narendra

doi:10.3389/fphy.2019.00080

Cited by 37 publications

(20 citation statements)

References 124 publications

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“…Therefore, the contribution to the precision parameters depends on the masses of the physical states as well as on the mixing angle sin θ l in the present setup. One can look at the study in [70] where a detailed analysis of electroweak precision test parameters S, T and U for the setup similar to ours has been presented.…”

Section: Scalar Singlet Dm With Vectorlike Leptonsmentioning

confidence: 99%

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

2020

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We study a scalar singlet dark matter (DM) having mass in the sub-TeV regime by extending the minimal scalar singlet DM setup by additional vectorlike fermions. While the minimal scalar singlet DM satisfies the relic and direct detection constraints for mass beyond TeV only, presence of its portal coupling with vectorlike fermions opens up additional coannihilation channels. These vectorlike fermions also help in achieving electroweak vacuum stability all the way up to Planck scale. We find that for one generation of vectorlike quarks consisting of a SUð2Þ L doublet and a singlet, scalar singlet DM with mass a few hundred GeV can indeed satisfy relic, direct detection and other relevant constraints while also making the electroweak vacuum absolutely stable. The same can be achieved by introducing vectorlike leptons too, but with three generations. While the model with vectorlike quarks is minimal, the three generations of vectorlike lepton doublet and neutral singlet can also give rise to light neutrino mass at one loop level.

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Section: Scalar Singlet Dm With Vectorlike Leptonsmentioning

confidence: 99%

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

2020

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“…The bound onŜ comes from a global fit: 10 3Ŝ = 0.0 ± 1.3 [71]. For S-parameter, we consider constraint only due to the VLFs, and is given by [21]:…”

Section: B Constraint From Electroweak Precision Observables (Ewpo)mentioning

confidence: 99%

“…This is crucial since the collider signature of the model favours large ∆M as we shall see later. As mentioned in [21], the values of Y and W are suppressed by the mass of the new fermions and hence they can be ignored.…”

Section: B Constraint From Electroweak Precision Observables (Ewpo)mentioning

confidence: 99%

“…Motivated by the two problems in the SM, we consider a popular DM scenario based on vector like fermions along with an extended gauge symmetry which not only stabilise DM but also plays a role in generating light neutrino masses along with the additional incentive of enhanced detection aspects. The DM is an admixture of a vector like singlet fermion and neutral component of a vector like SU (2) L doublet fermion, popularly known singlet-doublet fermion DM [11][12][13][14][15][16][17][18][19][20][21][22][23]. Typically, vector like fermion (VLF) dark matter in such scenarios are stabilised by an in-built Z 2 symmetry under which DM is odd while all SM particles are even.…”

Section: Introductionmentioning

confidence: 99%

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Flavoured gauge extension of singlet-doublet fermionic dark matter: neutrino mass, high scale validity and collider signatures

Barman

Borah

Ghosh

et al. 2019

J. High Energ. Phys.

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We propose an Abelian gauged version of the singlet-doublet fermionic dark matter (DM) model where DM, combination of a vector like fermion doublet and a fermion singlet, is naturally stabilised by the gauge symmetry without requiring any ad-hoc discrete symmetries. In order to have good detection prospects at collider experiments like the large hadron collider (LHC) and enlarged parameter space for low mass DM, we consider the additional gauge symmetry to be based on the quantum B − 3L τ where the restriction to third generation of leptons is chosen to have weaker bounds from the LHC on the corresponding gauge boson. The triangle anomalies arising in this model can be can cancelled by including a right handed neutrino which takes part in generating light neutrino masses through type I seesaw mechanism. Apart from DM, collider prospects and light neutrino masses, the model also offers high scale validity giving rise to a stable electroweak vacuum and perturbative couplings all the way up to the Planck scale. We constrain our model parameters from these requirements as well as existing relevant constraints related to DM and colliders. * bb1988@iitg.ac.in † dborah@iitg.ac.in ‡ Apart from DM, neutrino and collider prospects, the model comes up with additional advantage of providing a solution to the metastable nature of electroweak vacuum [47-54]. The negative fermionic contribution (primarily due to top quark and VLFs) to the renormalisation group (RG) running of the Higgs quartic coupling is compensated by respective contributions from additional scalars in the model 2 . In particular, the constraints from the requirement of vacuum stability restricts the gauge coupling of TeV scale B − 3L τ gauge symmetry to g B−3Lτ < ∼ 0.25 and SM Higgs coupling with VLF to Y < ∼ 0.3. For such couplings, the model also remains perturbative all the way upto the Planck scale. This paper is organised as follows: In section II we have introduced the new particles in our model and their interaction Lagrangian. In section III we have discussed the constraints on the model parameters arising from stability, unitarity and perturbativity of the scalar potential, electroweak precision observables, LHC searches and generation of light neutrino mass requirements. The details of the parameter space scan for the DM phenomenology is elaborated in section IV where in subsection IV A we have illustrated the relic density allowed parameter space and in subsection IV B direct search is discussed. The high scale validity and perturbativity of the model is elaborated in section V, where we have also chosen some of the benchmark points satisfying all relevant constraints in order to perform the collider analysis. The collider signatures of the model, along with discovery potential in the LHC is thoroughly explained in section VI. Finally in section VII we have concluded and summarised our findings. II. THE MODEL: FIELDS AND INTERACTIONSWe first tabulate all the particles of the model in table I with their corresponding gauge charges.On top of the fam...

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“…In this article, we study these two puzzles within a simple extension of the Singlet-Doublet Dirac Dark Matter (SD 3 M) model [11]. In Singlet-Doublet DM scenarios, a singlet and a doublet fermionic fields are added to the SM and a mixture of such fields is a Majorana DM candidate [12][13][14][15][16][17][18][19][20][21][22][23]. In the Singlet-Doublet Dirac Dark Matter model, the DM candidate is a Dirac particle, which opens a vector portal to the SM via the Z gauge boson, resulting in a richer phenomenology.…”

Section: Introductionmentioning

confidence: 99%

Singlet-doublet Dirac dark matter and neutrino masses

2019

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We examine an extension of the Standard Model that addresses the dark matter puzzle and generates Dirac neutrinos masses through the radiative seesaw mechanism. The new field content includes a scalar field that plays an important role in setting the relic abundance of dark matter. We analyze the phenomenology in the light of direct, indirect, and collider searches of dark matter. In this framework, the dark matter candidate is a Dirac particle that is a mixture of new singlet-doublet fields with mass m χ 0 1 1.1 TeV. We find that the allowed parameter space of this model is broader than the well-known Majorana dark matter scenario.

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Mini Review on Vector-Like Leptonic Dark Matter, Neutrino Mass, and Collider Signatures

Cited by 37 publications

References 124 publications

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

Sub-TeV singlet scalar dark matter and electroweak vacuum stability with vectorlike fermions

Flavoured gauge extension of singlet-doublet fermionic dark matter: neutrino mass, high scale validity and collider signatures

Singlet-doublet Dirac dark matter and neutrino masses

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