Light dark matter from dark sector decay

We consider the gauged B − L model which is extended with a secluded dark sector, comprising of two dark sector particles. In this framework the lightest $$ \mathcal{Z} $$ Z 2-odd particle is the dark matter candidate, having a feeble interaction with all other SM and BSM states. The next-to-lightest $$ \mathcal{Z} $$ Z 2-odd particle in the dark sector is a super-wimp, with large interaction strength with the SM and BSM states. We analyse all the relevant production processes that contribute to the dark matter relic abundance, and broadly classify them in two different scenarios, a) dark matter is primarily produced via the non-thermal production process, b) dark matter is produced mostly from the late decay of the next-to-lightest $$ \mathcal{Z} $$ Z 2-odd particle. We discuss the dependency of the relic abundance of the dark matter on various model parameters. Furthermore, we also analyse the discovery prospect of the BSM Higgs via invisible Higgs decay searches.

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“…The entropy of the universe increases after the decay of φ D . The increase in entropy can be approximated [42] as,…”

Section: Jhep05(2022)182mentioning

confidence: 99%

Secluded dark matter in gauged B − L model

Bandyopadhyay

Mitra

Padhan

et al. 2022

J. High Energ. Phys.

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“…The entropy of the universe increases after the decay of φ D . The increase in entropy can be approximated [40] as, Due to the small value of Y Dχ , φ D decays in the late epoch of the universe when the universe temperature is around MeV. This leads to negligible amount of increase in entropy density in the universe, otherwise such increase in entropy can dilute the DM produced in an early epoch.…”

Section: Super-wimp φ D + Fimp Dm χmentioning

confidence: 99%

Secluded Dark Matter in Gauged $B-L$ Model

Bandyopadhyay,

Mitra,

Padhan

et al. 2022

Preprint

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We consider a secluded dark sector, comprising of two dark sector particles, where the lightest Z 2 -odd particle is the dark matter candidate, having a feeble interaction with all other SM and BSM states. The next-to-lightest Z 2 -odd particle in the dark sector is a super-wimp, with large interaction strength with the SM and BSM states. We analyse all the relevant production processes that contribute to the dark matter relic abundance, and broadly classify them in two different scenarios, a) dark matter is primarily produced via the non-thermal production process, b) dark matter is produced mostly from the late decay of the next-to-lightest Z 2 -odd particle. We discuss the dependency of the relic abundance of the dark matter on various model parameters. Furthermore, we also analyse the discovery prospect of the BSM Higgs via invisible Higgs decay searches.

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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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Light dark matter from dark sector decay

Cited by 12 publications

References 38 publications

Secluded dark matter in gauged B − L model

Secluded dark matter in gauged B − L model

Secluded Dark Matter in Gauged $B-L$ Model

Dark matter in the type Ib seesaw model

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