Dark Matter Interpretation of the Super-Kamiokande Antineutrino Excess in $\mathrm{U}(1)_{L_μ-L_τ}$ model
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| Formato: | Preprint |
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2026
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| _version_ | 1866917540230332416 |
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| author | Endo, Motoi Mura, Yushi Tsuji, Tenta |
| author_facet | Endo, Motoi Mura, Yushi Tsuji, Tenta |
| contents | Recent Super-Kamiokande analyses of the diffuse supernova neutrino background, based on data across all SK phases, indicate a mild preference over the zero-DSNB hypothesis at the level of about $2.3σ$ with electron-like antineutrino events at $E_{\barν_e} \simeq 20\,\mathrm{MeV}$. We investigate whether this excess can be explained by MeV-scale dark matter annihilation into neutrinos in a $\mathrm{U}(1)_{L_μ- L_τ}$ model. The dark matter is a Dirac fermion with $m_χ\simeq 22\,\mathrm{MeV}$ that annihilates via a light $Z'$ mediator into $ν_μ\barν_μ$ and $ν_τ\barν_τ$, which are partly converted into $\barν_e$ through flavor oscillations. We find that this scenario simultaneously accounts for the excess and the observed relic abundance via thermal freeze-out. We further discuss the relevant laboratory and cosmological constraints, including neutrino trident production, NA64-$μ$, Borexino, and the contribution to $ΔN_\mathrm{eff}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_28275 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Dark Matter Interpretation of the Super-Kamiokande Antineutrino Excess in $\mathrm{U}(1)_{L_μ-L_τ}$ model Endo, Motoi Mura, Yushi Tsuji, Tenta High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment Recent Super-Kamiokande analyses of the diffuse supernova neutrino background, based on data across all SK phases, indicate a mild preference over the zero-DSNB hypothesis at the level of about $2.3σ$ with electron-like antineutrino events at $E_{\barν_e} \simeq 20\,\mathrm{MeV}$. We investigate whether this excess can be explained by MeV-scale dark matter annihilation into neutrinos in a $\mathrm{U}(1)_{L_μ- L_τ}$ model. The dark matter is a Dirac fermion with $m_χ\simeq 22\,\mathrm{MeV}$ that annihilates via a light $Z'$ mediator into $ν_μ\barν_μ$ and $ν_τ\barν_τ$, which are partly converted into $\barν_e$ through flavor oscillations. We find that this scenario simultaneously accounts for the excess and the observed relic abundance via thermal freeze-out. We further discuss the relevant laboratory and cosmological constraints, including neutrino trident production, NA64-$μ$, Borexino, and the contribution to $ΔN_\mathrm{eff}$. |
| title | Dark Matter Interpretation of the Super-Kamiokande Antineutrino Excess in $\mathrm{U}(1)_{L_μ-L_τ}$ model |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.28275 |