Right-handed Neutrino Dark Matter with Radiative Neutrino Mass in Gauged $B-L$ Model

Borah, Debasish; Nanda, Dibyendu; Narendra, Nimmala; Sahu, Narendra

doi:10.48550/arxiv.1810.12920

Cited by 6 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the components of Z 2 odd scalar doublet can be produced at a significant rate at collider experiments like the large hadron collider (LHC) due to its electroweak gauge interactions. If it has tiny couplings with SM charged leptons like the ones we have considered in our work, we can have displaced vertex signatures at colliders, as discussed in a recent work [46]. Our model also has additional colored vector like Z 2 odd fermions which can also give rise to similar signatures at colliders.…”

Section: Discussionmentioning

confidence: 56%

Connecting ANITA anomalous events to a nonthermal dark matter scenario

et al. 2020

Self Cite

View full text Add to dashboard Cite

The ANtarctic Impulsive Transient Antenna (ANITA) collaboration has observed two EeVenergy, upward going events originating from below the horizon. As no standard model (SM) particles, propagating through the earth at such energy and exit angles, can give rise to the required survival probability for the observed events, several beyond standard model (BSM) proposals have come up. We propose a scenario where a Z 2 odd sector is responsible for such anomalous events. The next to lightest Z 2 odd particle or the next to lightest stable particle (NLSP), created from ultra high energy neutrino interactions with nucleons, can pass through the earth and then decay into the lightest Z 2 odd particle or the lightest stable particle (LSP) and a tau lepton. The long lived nature of the NLSP requires its coupling with the LSP to be very small, keeping the LSP out of thermal equilibrium in the early universe. The LSP can then be a non-thermal dark matter while the tau leptons produced from NLSP decay after passing through earth can explain the ANITA events. We first show that a purely non-thermal dark matter scenario can not give rise to the required event rates while a hybrid scenario where dark matter can have both thermal as well non-thermal contribution to its relic abundance, serves the purpose. * dborah@iitg.ac.in

show abstract

Section: Discussionmentioning

confidence: 56%

Connecting ANITA anomalous events to a nonthermal dark matter scenario

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…• Ω 1 h 2 conversion in scotogenic models can be sizeable and saturate experimental upper bounds on corresponding branching ratios for fermion DM scenario [65,137,138], in our model they are likely to be suppressed as the singlet fermions N 1,2 are heavier than the scale of leptogenesis.…”

Section: Dark Mattermentioning

confidence: 49%

“…The enhancement in dilepton plus MET signal in the presence of additional vector like singlet charged leptons was also discussed in [64]. Exotic signatures like displaced vertex and disappearing or long-lived charged track for compressed mass spectrum of inert scalars and singlet fermion DM was studied recently by the authors of [65].…”

Section: A Constraints On Model Parametersmentioning

confidence: 99%

Dark Sector Assisted Low Scale Leptogenesis from Three Body Decay

Borah¹,

Dasgupta²,

Mahanta³

2020

Preprint

Self Cite

View full text Add to dashboard Cite

We study the possibility of realising tree level leptogenesis from three body decay, dark matter and neutrino mass in a minimal framework. We propose a first of its kind model to implement the idea of leptogenesis from three body decay where CP asymmetry arises from interference of multiple tree level diagrams. The standard model is extended by three heavy singlet fermions, one scalar singlet and one scalar doublet with appropriate discrete charges. Two of these singlet fermions not only play non-trivial roles in generating light neutrino mass at radiative level in scotogenic fashion, but also act as mediators in three body decay of the third singlet fermion leading to desired CP asymmetry through interference of tree level diagrams. With just one additional field compared to the minimal scotogenic model, we show that successful leptogenesis can occur at a scale as low as 1 TeV which is lower than the leptogenesis scale found for scotogenic model. Also, the realisation of this tree level three body decay leptogenesis naturally leads to a two component scalar singlet-doublet dark matter scenario offering a rich phenomenology. Apart from having interesting interplay of different couplings involved in processes related to both leptogenesis and dark matter, the model can also be tested at different experiments due to the existence of its particle spectrum at TeV scale.

show abstract

“…The enhancement in dilepton plus MET signal in the presence of additional vector like singlet charged leptons was also discussed in [80]. Exotic signatures like displaced vertex and disappearing or long-lived charged track for compressed mass spectrum of inert scalars and singlet fermion DM was studied recently by the authors of [81].…”

Section: A Constraints On Model Parametersmentioning

confidence: 99%

Observable Gravitational Waves in Minimal Scotogenic Model

Borah,

Dasgupta,

Fujikura

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

We scrutinise the widely studied minimal scotogenic model of dark matter and radiative neutrino mass from the requirement of a strong first order electroweak phase transition (EWPT) and observable gravitational waves at future planned space based experiments. The scalar DM scenario is similar to inert scalar doublet extension of standard model where a strong first order EWPT favours the low mass regime of DM, a narrow fine tuned region currently allowed from collider and direct detection bounds. In the fermion DM scenario, we get newer region of parameter space which favours strong first order EWPT as the restriction on mass ordering within inert scalar doublet gets relaxed. While such leptophilic fermion DM remains safe from stringent direct detection bounds, newly allowed low mass regime of charged scalar can leave tantalising signatures at colliders. While we get such new region of parameter space satisfying DM relic, strong first order EWPT with detectable gravitational waves, light neutrino mass and other relevant constraints, we also improve upon previous analysis in similar model by incorporating appropriate resummation effects in effective finite temperature potential.

show abstract

Right-handed Neutrino Dark Matter with Radiative Neutrino Mass in Gauged $B-L$ Model

Cited by 6 publications

References 0 publications

Connecting ANITA anomalous events to a nonthermal dark matter scenario

Connecting ANITA anomalous events to a nonthermal dark matter scenario

Dark Sector Assisted Low Scale Leptogenesis from Three Body Decay

Observable Gravitational Waves in Minimal Scotogenic Model

Contact Info

Product

Resources

About