Kaon Portal to Freeze-in Dark Matter
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910197716353024 |
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| author | Endo, Motoi Yamanaka, Takumu |
| author_facet | Endo, Motoi Yamanaka, Takumu |
| contents | We investigate freeze-in production of light dark matter through the quark flavor-changing operator $(\bar{s}γ_μd)(\barχγ^μχ)$ in a low-reheating cosmology. For reheating temperatures below the QCD crossover, kaon decays and scatterings generate the dark matter abundance through $K\toπχ\barχ$ and $Kπ\toχ\barχ$. The same interaction induces the rare kaon decays $K^+\toπ^+χ\barχ$ and $K_L\toπ^0χ\barχ$. This links the freeze-in relic abundance to searches at NA62, KOTO, and KOTO II. We find that lower reheating temperatures require larger couplings to compensate for the Boltzmann-suppressed kaon abundance, making kaon-driven freeze-in dark matter testable at rare kaon decay experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_05947 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Kaon Portal to Freeze-in Dark Matter Endo, Motoi Yamanaka, Takumu High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment We investigate freeze-in production of light dark matter through the quark flavor-changing operator $(\bar{s}γ_μd)(\barχγ^μχ)$ in a low-reheating cosmology. For reheating temperatures below the QCD crossover, kaon decays and scatterings generate the dark matter abundance through $K\toπχ\barχ$ and $Kπ\toχ\barχ$. The same interaction induces the rare kaon decays $K^+\toπ^+χ\barχ$ and $K_L\toπ^0χ\barχ$. This links the freeze-in relic abundance to searches at NA62, KOTO, and KOTO II. We find that lower reheating temperatures require larger couplings to compensate for the Boltzmann-suppressed kaon abundance, making kaon-driven freeze-in dark matter testable at rare kaon decay experiments. |
| title | Kaon Portal to Freeze-in Dark Matter |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.05947 |