Light dark matter from dark sector decay

Cheng, Yu; Liao, Wei

doi:10.48550/arxiv.2012.01875

Cited by 2 publications

(3 citation statements)

References 27 publications

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“…In our FIMP DM scenarios, the next lightest stable particle (NLSP) decays into DM and sterile neutrinos N when N is light enough. For λ ds 10 −12 , NLSP decays fast to avoid constraints from BBN [37]. On the other hand, NLSP will decay to DM and light neutrinos through χ → φν or φ → χν when the N is heavier than the dark sector.…”

Section: Constraintsmentioning

confidence: 99%

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Sterile Neutrino Portal Dark Matter in $ν$THDM

Liu¹,

Shao²,

Han³

et al. 2022

Preprint

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In this paper, we propose the sterile neutrino portal dark matter in νTHDM. This model can naturally generate tiny neutrino mass with the neutrinophilic scalar doublet Φ ν and sterile neutrinos N around TeV scale. Charged under a Z 2 symmetry, one Dirac fermion singlet χ and one scalar singlet φ are further introduced in the dark sector. The sterile neutrinos N are the mediators between the DM and SM. Depending on the coupling strength, the DM can be either WIMP or FIMP. For the WIMP scenario, pair annihilation of DM into N N is the key channel to satisfy various bounds, which could be tested at indirect detection experiments. For the FIMP scenario, besides the direct production of DM from freeze-in mechanism, contributions from late decay of NLSP is also important. When sterile neutrinos are heavier than the dark sector, NLSP is long-lived due to tiny mixing angle between sterile and light neutrinos. Constrains from free-streaming length, CMB, BBN and neutrino experiments are considered.

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Section: Constraintsmentioning

confidence: 99%

“…Meanwhile, observable signature is still expected by indirect detection [28][29][30]32]. On the other hand, the coupling between DM and N can be tiny, thereby producing DM via the freeze-in mechanism [33][34][35][36][37][38][39]. Leptogenesis in the frame work of neutrino portal DM is also discussed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Sterile Neutrino Portal Dark Matter in $ν$THDM

Liu¹,

Shao²,

Han³

et al. 2022

Preprint

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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 [102][103][104][105][106][107][108][109][110][111][112]. Some recent research [102][103][104] 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 [113,114].…”

mentioning

confidence: 99%

Dark Matter in the Type Ib Seesaw Model

Chianese,

Fu,

King

2021

Preprint

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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 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. CONTENTSA. Constraints on the Higgs portal couplings 13References 13

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Light dark matter from dark sector decay

Cited by 2 publications

References 27 publications

Sterile Neutrino Portal Dark Matter in $ν$THDM

Sterile Neutrino Portal Dark Matter in $ν$THDM

Dark Matter in the Type Ib Seesaw Model

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