Superheavy Supersymmetric Dark Matter for the origin of KM3NeT Ultra-High Energy signal
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| Format: | Preprint |
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2025
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| _version_ | 1866908799303942144 |
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| author | Jho, Yongsoo Park, Seong Chan Shin, Chang Sub |
| author_facet | Jho, Yongsoo Park, Seong Chan Shin, Chang Sub |
| contents | We propose an explanation for the recently reported ultra-high-energy neutrino signal at KM3NeT, which shows no clear association with known astrophysical sources. While decaying dark matter in the Galactic Center is a natural candidate, the observed arrival direction strongly suggests an extragalactic origin. We introduce a multicomponent dark matter scenario in which the components are part of a supermultiplet, with supersymmetry ensuring a nearly degenerate mass spectrum among the fields with different spins. In this setup, a cosmologically long-lived fermionic state decays into a slightly lighter bosonic dark matter state, producing a boosted neutrino spectrum with energy $E_ν\sim 100$ PeV, determined by the mass difference. The heavy-to-light decay occurs at a cosmological redshift of $z \sim \text{a few}$ or higher, leading to an isotropic directional distribution of the signal. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18737 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superheavy Supersymmetric Dark Matter for the origin of KM3NeT Ultra-High Energy signal Jho, Yongsoo Park, Seong Chan Shin, Chang Sub High Energy Physics - Phenomenology High Energy Astrophysical Phenomena We propose an explanation for the recently reported ultra-high-energy neutrino signal at KM3NeT, which shows no clear association with known astrophysical sources. While decaying dark matter in the Galactic Center is a natural candidate, the observed arrival direction strongly suggests an extragalactic origin. We introduce a multicomponent dark matter scenario in which the components are part of a supermultiplet, with supersymmetry ensuring a nearly degenerate mass spectrum among the fields with different spins. In this setup, a cosmologically long-lived fermionic state decays into a slightly lighter bosonic dark matter state, producing a boosted neutrino spectrum with energy $E_ν\sim 100$ PeV, determined by the mass difference. The heavy-to-light decay occurs at a cosmological redshift of $z \sim \text{a few}$ or higher, leading to an isotropic directional distribution of the signal. |
| title | Superheavy Supersymmetric Dark Matter for the origin of KM3NeT Ultra-High Energy signal |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2503.18737 |