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ν limits from Super-Kamiokande on dark matter-electron scattering in the Sun

Dhashin Krishna1,*, Rinchen Sherpa1,†, Akash Kumar Saha1,‡, Tarak Nath Maity2,3,4,§, Ranjan Laha1,∥, and Nirmal Raj1,¶

  • *Contact author: mdhashinkrishna@gmail.com
  • †Contact author: rinchens@iisc.ac.in
  • ‡Contact author: akashks@iisc.ac.in
  • §Contact author: tarak.maity.physics@gmail.com
  • ∥Contact author: ranjanlaha@iisc.ac.in
  • Contact author: nraj@iisc.ac.in
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Phys. Rev. D 114, L081305 – Published 14 October, 2026

DOI: https://doi.org/10.1103/4d71-7gzb

Abstract

Particle dark matter scattering on electrons in the Sun may gravitationally capture and self-annihilate inside it to neutrinos and antineutrinos or other final states that in turn decay to them. Using up-to-date Super-Kamiokande measurements of atmospheric electron-type and muon-type neutrinos fluxes, we set the most stringent limits on the electron scattering cross sections for leptophilic dark matter, annihilating to νν¯ and τ+τ− with 100% branching ratio, over mass ranges of ∼5–100 and ∼15–100  GeV, respectively. These limits excludes cross sections down to about 10−40–10−39  cm2 which 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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Corrections

3 November, 2026

Correction: A statement was missing from the Acknowledgments and has been inserted.

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Outline

Information

Phys. Rev. D 114, L081305– Published 14 October, 2026
  • Received 10 March 2025
  • Accepted 3 September 2026
  • Corrected 3 November 2026
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