DAMPE electron-positron excess in leptophilic Z′ model

Ghorbani, Karim; Ghorbani, Parsa Hossein

doi:10.1007/jhep05(2018)125

Cited by 12 publications

(6 citation statements)

References 57 publications

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“…Recently, the DAMPE collaboration reported its first result of the total CR e ± spectrum in the energy range from 25 GeV to 4.6 TeV [17]. Many studies have been performed to explain the tentative features in this spectrum [18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45].…”

Section: Introductionmentioning

confidence: 99%

Explanations of the DAMPE high energy electron/positron spectrum in the dark matter annihilation and pulsar scenarios

Wang

Lin

et al. 2018

Sci. China Phys. Mech. Astron.

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Many studies have shown that either the nearby astrophysical source or dark matter (DM) annihilation/decay is required to explain the origin of high energy cosmic ray (CR) e ± , which are measured by many experiments, such as PAMELA and AMS-02. Recently, the Dark Matter Particle Explorer (DAMPE) collaboration has reported its first result of the total CR e ± spectrum from 25 GeV to 4.6 TeV with high precision. In this work, we study the DM annihilation and pulsar interpretations of the DAMPE high energy e ± spectrum. In the DM scenario, the leptonic annihilation channels to τ + τ − , 4µ, 4τ , and mixed charged lepton final states can well fit the DAMPE result, while the µ + µ − channel has been excluded. In addition, we find that the mixed charged leptons channel would lead to a sharp drop at ∼ TeV. However, these DM explanations are almost excluded by the observations of gamma-ray and CMB, unless some complicated DM models are introduced. In the pulsar scenario, we analyze 21 nearby known pulsars and assume that one of them is the primary source of high energy CR e ± . Considering the constraint from the Fermi-LAT observation of the e ± anisotropy, we find that two pulsars are possible to explain the DAMPE data. Our results show that it is difficult to distinguish between the DM annihilation and single pulsar explanations of high energy e ± with the current DAMPE result.

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Section: Introductionmentioning

confidence: 99%

Explanations of the DAMPE high energy electron/positron spectrum in the dark matter annihilation and pulsar scenarios

Wang

Lin

et al. 2018

Sci. China Phys. Mech. Astron.

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“…This excess of electrons/positrons in cosmic rays could be a signal from DM [20]. Assuming that there exists a DM sub-halo near the solar system, many groups use specific DM models to explain cosmic electron and positron excess [21][22][23][24][25][26][27][28]. The CALorimetric Electron Telescope (CALET) collaboration also reported the cosmic electron and positron spectrum to range from 11 GeV to 4.8 TeV [29,30].…”

Section: Introductionmentioning

confidence: 99%

Dark matter annihilation into leptons through gravity portals

Xudong

Dai

2021

J. High Energ. Phys.

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Dark matter (DM) constitutes 85% of the matter in the Universe. However, its specific particle property is still unclear. The fundamentals of DM particles subject to gravitational interaction, and that the lepton excess in cosmic rays may originate from DM particles, inspired us to investigate DM particle properties beyond the standard model. We assume that a leptophilic SU(2) doublet exists in nature as the mediator connecting DM with visible leptons. Since general relativity is not renormalizable at the quantum level, it should be regarded as an effective field theory’s leading order term. One species of the next-to-leading-order term should be operators linear to the Ricci scalar and containing scalar fields, such as the Higgs field, scalar DM, or the newly introduced SU(2) scalar doublet. These operators can cause DM annihilation through gravity portals. We analyzed constraints from the cosmic antiproton flux, DM relic abundance, cosmic positron flux, cosmic microwave background, and direct detection experiments. The result shows that there is a vast parameter space that is compatible with current experiments. DM with a mass of electroweak scale is only allowed to annihilate into leptons. We further show that the purely gravitational DM better explains the DArk Matter Particle Explorer cosmic lepton excess. Our work provides a promising mechanism for DM particles to connect with standard model particles.

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“…In order to explain the deviation a large number of investigations applying various models beyond the SM are performed. Among them there are models introducing DM candidates interacting with the SM leptons via leptophilic scalar [34,35,36,37,38,39,40,41,42,43,44], via generic scalar mediator [45,46,47] and through vector mediator [48,49,50,51], emphasising on the MAMM.…”

Section: Introductionmentioning

confidence: 99%

Light vector dark matter with scalar mediator and muon g-2 anomaly

Ghorbani

2021

Preprint

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We study a model with a vector dark matter candidate interacting with the SM charged leptons through a scalar portal. The dark matter candidate acquires mass when the scalar breaks an abelian gauge symmetry spontaneously. The scalar mediator being leptophilic only induces elastic scattering of dark matter with electrons at the leading order (tree level). Given the recent results from Xenon1T upper bounds on dark matter-electron elastic scattering cross section where the strongest sensitivity lies in the range ∼ O(1) GeV, we find the viable space in the parameter space respecting constraints from the observed relic density, muon g-2 anomaly, e + e − colliders, electron beam-dump experiments and astrophysical observables. It is shown that the current upper bounds of Xenon1T is partially sensitive to the viable parameter space, such that it excludes the scalar mediator with masses m s 3 MeV for DM masses m DM ∼ 0.1 − 10 GeV. We also found that the sensitivity reach of the Xenon1T is about one order of magnitude weaker than that of the electron beam-dump experiments.

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DAMPE electron-positron excess in leptophilic Z′ model

Cited by 12 publications

References 57 publications

Explanations of the DAMPE high energy electron/positron spectrum in the dark matter annihilation and pulsar scenarios

Explanations of the DAMPE high energy electron/positron spectrum in the dark matter annihilation and pulsar scenarios

Dark matter annihilation into leptons through gravity portals

Light vector dark matter with scalar mediator and muon g-2 anomaly

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