Multipartite dark matter with scalars, fermions and signatures at LHC

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The idea of this work is to investigate the constraints on the dark matter (DM) allowed parameter space from high scale validity (absolute stability of Higgs vacuum and perturbativity) in presence of multi particle dark sector and heavy right handed neutrinos to address correct neutrino mass. We illustrate a simple two component DM model, consisting of one inert SU (2) L scalar doublet and a scalar singlet, both stabilised by additional Z 2 ×Z 2 symmetry, which also aid to vacuum stability. We demonstrate DM-DM interaction helps achieving a large allowed parameter space for both the DM components by evading direct search bound. High scale validity puts further constraints on the model, for example, on the mass splitting between the charged and neutral component of inert doublet, which has important implication to its leptonic signature(s) at the Large Hadron Collider (LHC).

Section: Introductionmentioning

confidence: 99%

Two component dark matter with inert Higgs doublet: neutrino mass, high scale validity and collider searches

Bhattacharya

Ghosh

Saha

et al. 2020

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“…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%

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

Barman

Borah

Ghosh

et al. 2019

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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...

“…Though a single component DM is a very minimal and predictive scenario to begin with, a richer dark sector may in fact be natural given the complicated visible sector. There have been several proposals for multi-component WIMP dark matter during last few years, some of which can be found in [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]. Going from single component to multi-component DM sector can significantly alter the direct as well as indirect detection rates for DM.…”

Section: Introductionmentioning

confidence: 99%

Type III seesaw for neutrino masses in U(1)B−L model with multi-component dark matter

Biswas

Borah

Nanda

2019

We propose a B − L gauged extension of the Standard Model where light neutrino masses arise from type III seesaw mechanism. Unlike the minimal B −L model with three right handed neutrinos having unit lepton number each, the model with three fermion triplets is however not anomaly free. We show that the leftover triangle anomalies can be cancelled by two neutral Dirac fermions having fractional B − L charges, both of which are naturally stable by virtue of a remnant Z 2 × Z 2 symmetry, naturally leading to a two component dark matter scenario without any ad-hoc symmetries. We constrain the model from all relevant phenomenological constraints including dark matter properties. Light neutrino mass and collider prospects are also discussed briefly. Due to additional neutral gauge bosons, the fermion triplets in type III seesaw can have enhanced production cross section in collider experiment.