$\nu$ limits from Super-Kamiokande on dark matter-electron scattering in the Sun

Dhashin Krishna; Rinchen Sherpa; Akash Kumar Saha; Tarak Nath Maity; Ranjan Laha; Nirmal Raj

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arXiv · 2503.07713

$\nu$ limits from Super-Kamiokande on dark matter-electron scattering in the Sun

Dhashin Krishna·Rinchen Sherpa·Akash Kumar Saha·Tarak Nath Maity·Ranjan Laha·Nirmal Raj

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Abstract

Particle dark matter scattering on electrons in the Sun may gravitationally capture and self-annihilate inside it to neutrinos and anti-neutrinos, or other final states that in turn decay to them. Using up-to-date measurements by Super-Kamiokande of the fluxes of atmospheric electron-type and muon-type neutrinos, we set the most stringent limits on the electron scattering cross sections of dark matter down to about $10^{-40}-10^{-39}$ cm$^2$ over a mass range of 4$-$200 GeV. These outdo direct searches for dark matter-electron scattering and previously set limits at IceCube. We also derive corresponding reaches at Hyper-K, and show that atmospheric neutrino observations restricted to the direction of the Sun can improve sensitivities.

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Dhashin Krishna, Rinchen Sherpa, Akash Kumar Saha, Tarak Nath Maity, Ranjan Laha, Nirmal Raj. 2025-03-10. $\nu$ limits from Super-Kamiokande on dark matter-electron scattering in the Sun. https://arxiv.org/abs/2503.07713

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