Annihilation signatures of neutron dark decay models in neutron oscillation and proton decay searches

Keung, Wai-Yee; Marfatia, Danny; Tseng, Po-Yan

doi:10.1007/jhep09(2019)053

Cited by 16 publications

(14 citation statements)

References 34 publications

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“…The DM particle is very slightly lighter than the neutron and is a Dirac fermion to avoid constraints from neutron-antineutron oscillations. Multi-pion signatures in neutron-antineutron oscillation searches by Super-Kamiokande only constrain the model if the DM isχ [18]. The model is interesting in that, as we will see, a NS can be composed of a substantial DM population, so that the DM capture rate can reach the geometric limit through DM self-interactions even if the DM-neutron scattering cross section is small.…”

Section: Jhep07(2020)181mentioning

confidence: 89%

Heating neutron stars with GeV dark matter

Keung

Marfatia

Tseng

2020

J. High Energ. Phys.

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An old neutron star (NS) may capture halo dark matter (DM) and get heated up by the deposited kinetic energy, thus behaving like a thermal DM detector with sensitivity to a wide range of DM masses and a variety of DM-quark interactions. Near future infrared telescopes will measure NS temperatures down to a few thousand Kelvin and probe NS heating by DM capture. We focus on GeV-mass Dirac fermion DM (which is beyond the reach of current DM direct detection experiments) in scenarios in which the DM capture rate can saturate the geometric limit. For concreteness, we study (1) a model that invokes dark decays of the neutron to explain the neutron lifetime anomaly, and (2) a framework of DM coupled to quarks through a vector current portal. In the neutron dark decay model a NS can have a substantial DM population, so that the DM capture rate can reach the geometric limit through DM self-interactions even if the DM-neutron scattering cross section is tiny. We find NS heating to have greater sensitivity than multi-pion signatures in large underground detectors for the neutron dark decay model, and sub-GeV gamma-ray signatures for the quark vector portal model.

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Section: Jhep07(2020)181mentioning

confidence: 89%

Heating neutron stars with GeV dark matter

Keung

Marfatia

Tseng

2020

J. High Energ. Phys.

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“…In Models 1A-1C, the dark matter χ can annihilate with the neutron, leading to signatures such as χ n → γ + meson(s) at Super-Kamiokande and the future DUNE [34]. We will discuss this in more detail in the context of Model 2A below.…”

Section: Model 1a (Qqqχ)mentioning

confidence: 99%

“…This model also predicts striking signatures in direct detection experiments: χ N → φ * + meson(s), where N is a proton or a neutron. Such signals were studied in [34,[37][38][39] and include: χ n → φ * π 0 , χ p → φ * π + , χ n → φ * K 0 and χ p → φ * K + . Interestingly, not all of them are present in Model 2A.…”

Section: Model 2a (Qqqχφ)mentioning

confidence: 99%

Baryonic and Leptonic GeV Dark Matter

Fornal,

Hewitt,

Zhao

2020

Preprint

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We perform a systematic analysis of models with GeV-scale dark matter coupled to baryons and leptons. Such theories provide a natural framework to explain the matter-antimatter asymmetry of the universe. We find that only a few baryonic dark matter models are free from tree-level proton decay without explicitly imposing baryon number conservation. We enumerate those cases and provide a brief overview of their phenomenology. We then focus on a leptonic dark matter model for a more detailed discussion of the baryon asymmetry generation via leptogenesis, the symmetry restoration in the dark sector and the expected dark matter annihilation signals in indirect detection experiments.

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“…Ref. [85] determined that ∼ 10 6 signal events would be registered in the multi-pion channel post kinematic cuts for a benchmark θ = 6 × 10 −11 . About 20 background events are expected in this region, thus this translates to a limit of θ 4 × 10 −12 eV, which is more than an order of magnitude stronger than the SNO limit on n DM (see Table I).…”

Section: Dark Neutrons As Dark Matter: Absorption Signalsmentioning

confidence: 99%

Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals

Hostert¹,

McKeen²,

Pospelov³

et al. 2022

Preprint

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We propose new searches for n , a dark baryon that can mix with the Standard Model neutron. We show that IsoDAR, a proposal to place an intense cyclotron near a large-volume neutrino detector deep underground, can look for n → n → n transitions with much lower backgrounds than surface experiments. This neutron-shining-through-a-wall search would be possible without any modifications to the experiment and would provide the strongest laboratory constraints on the n-n mixing for a wide range of mass splittings. We also consider dark neutrons as dark matter and show that their nuclear absorption at deep-underground detectors such as SNO and Borexino places some of the strongest limits in parameter space. Finally, we describe other n signatures, such as neutrons shining through walls at spallation sources, reactors, and the disappearance of ultracold neutrons.

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Annihilation signatures of neutron dark decay models in neutron oscillation and proton decay searches

Cited by 16 publications

References 34 publications

Heating neutron stars with GeV dark matter

Heating neutron stars with GeV dark matter

Baryonic and Leptonic GeV Dark Matter

Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals

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