Connecting multi-lepton anomalies at the LHC and in Astrophysics with MeerKAT/SKA

Beck, Geoff; Temo, Ralekete; Elias, Malwa,; Kumar, M.; Mellado, B.

doi:10.1016/j.astropartphys.2023.102821

Cited by 5 publications

(9 citation statements)

References 64 publications

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“…Because of its high sensitivity and energy resolution, SKA can soon set sensitivities of radio emission around O(µJy [102]. The SKA sensitivities have been used to investigate for signals from the DM-induced synchrotron [91,103,104] and ICS emission [105]. In this work, we adopt the same approach in our previous work [58].…”

Section: Total Dm-induced Photon Spectrummentioning

confidence: 99%

Multi-frequency test of dark matter annihilation into long-lived particles in Sirius

Chen

Xia

et al. 2023

J. Cosmol. Astropart. Phys.

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New long-lived particles produced at the colliders may escape from conventional particle detectors. Using satellites or ground telescopes, we can detect the photons generated from the annihilation of the star-captured dark matter into a pair of long-lived particles. When the propagation length of these long-lived particles surpasses the interplanetary distance between the Sun and Jupiter, it becomes unfeasible to detect such dark matter signals originating from the Sun or Jupiter on Earth. Our analysis of the dark matter-induced photons produced by prompt radiation, inverse Compton scattering, and synchrotron radiation mechanisms reveals that a decay length of about 10-3 pc for long-lived particles is required for maximum detectability. We investigate the parameters that allow the long-lived particle's lifetime to be consistent with Big Bang nucleosynthesis while also allowing it to escape the confines of our solar system. The Sirius system is proposed as a promising target for the indirect detection of such long-lived particles. Utilizing the prompt, inverse Compton scattering, and synchrotron radiation, upper limits on the dark matter-proton spin-independent and spin-dependent cross section are estimated with the Fermi-LAT null-signal observation and the capabilities of the upcoming Square Kilometre Array radio telescope.

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Section: Total Dm-induced Photon Spectrummentioning

confidence: 99%

Multi-frequency test of dark matter annihilation into long-lived particles in Sirius

Chen

Xia

et al. 2023

J. Cosmol. Astropart. Phys.

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“…where 𝑑Ω = 2𝜋 sin 𝜃𝑑𝜃, 𝑧 is the line of sight coordinate, 𝜌 𝜒 is the DM density, 𝑟 = √︃ 𝑧 2 + 𝑑 2 𝐿 − 2𝑧𝑑 𝐿 cos 𝜃 is the spherical radius, 𝑑 𝐿 is the halo luminosity distance, ⟨𝜎𝑉⟩ is the thermally averaged DM annihilation cross-section, 𝑀 𝜒 is the DM mass, and 𝑑 𝑁 𝛾 𝑑𝐸 (𝑀 𝜒 , 𝐸) characterise the number of photons per annihilation. For these last functions we use [16] for the 2HDM+𝑆 model and [17,18] for the 𝑏-quark channel. The limits of 𝑧 integration are…”

Section: Geoff Beckmentioning

confidence: 99%

“…More details of the model and the anomalies can be found in [15] (and references therein). The consequences of a DM candidate coupling to the 𝑆 boson have been explored in dwarf galaxies at radio frequencies in [16].…”

Section: Introductionmentioning

confidence: 99%

“…This is through a combination of extant Fermi-LAT data and forecasting with the MeerKAT sensitivity. In addition, Omega-Centauri can potentially rule out the 2HDM+𝑆 DM scenario for the parameter space which explains several astrophysical anomalies (see [16] for details). These results suggest that further study of Omega Centauri's dynamics are vital, as it potentially presents the most powerful opportunity for indirect DM searches to date.…”

Section: Introductionmentioning

confidence: 99%

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Multi-frequency probes of 2HDM+S dark matter

Beck

2023

Proceedings of High Energy Astrophysics in Southern Africa 2022 — PoS(HEASA2022)

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The two-Higgs-doublet with additional scalar (2HDM+𝑆) model is one proposed to account for several anomalies that have persisted and increased in significance over runs 1 and 2 at the Large Hadron Collider (LHC). In addition to this, 2HDM+𝑆 also supplies a potential Dark Matter (DM) candidate coupling to the Standard Model via the 𝑆 boson. So far, this model has been difficult to constrain by indirect means. Here we will explore the potential of Omega Centauri, a nearby globular cluster to constrain this interesting DM model. Although such structures are generally considered to be lacking in DM, arguments have been made that this cluster is in fact the relic of a tidally stripped dwarf galaxy. In such a scenario, the DM content would be significant. Combined with its nearness, this would suggest a potential for powerful indirect DM signals. We employ both Fermi-LAT gamma-ray data, as well as MeerKAT telescope sensitivities to determine the current status of Omega Centauri as a source of indirect constraints on Weakly Interacting Massive Particles (WIMPs) in a 2HDM+𝑆 scenario and for general annihilation channels.

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“…Note that for λ1 ∼ k1 ∼ 1, S1 significantly mixes with the Higgs doublets after electroweak symmetry breaking. Therefore, it affects the electroweak symmetry breaking as well as the collider and cosmological/astrophysical phenomena, which should be carefully investigated (see e.g., refs [91,92]…”

mentioning

confidence: 99%

Flavor- and CP-safe explanation of gμ − 2 anomaly

Evans

Yanagida

Yokozaki

2023

J. High Energ. Phys.

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Supersymmetry is still a viable explanation for the muon g – 2 anomaly, if the sleptons and electroweak gauginos are $$ \mathcal{O}(100) $$ O 100 GeV. However, for supersymmetry breaking masses this light, the SUSY flavor and CP-problem are exacerbated. To address this issue, we consider a flavor-safe gauge mediated explanation of the muon g – 2 with additional Higgs soft supersymmetry breaking mass parameters. The setup provides a generic parameter space within minimal gauge mediation. Furthermore, we show that the problematic CP violating phase can be dynamically suppressed. We find that gauge mediation models have large portions of parameter space where the muon g – 2 can be explained at 1 σ level. The interplay between the slepton and the CP-odd Higgs masses also makes the majority of this model’s parameter space testable at the LHC through searches for sleptons or additional Higgs bosons.

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Connecting multi-lepton anomalies at the LHC and in Astrophysics with MeerKAT/SKA

Cited by 5 publications

References 64 publications

Multi-frequency test of dark matter annihilation into long-lived particles in Sirius

Multi-frequency test of dark matter annihilation into long-lived particles in Sirius

Multi-frequency probes of 2HDM+S dark matter

Flavor- and CP-safe explanation of gμ − 2 anomaly

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