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  • Open Access

Constraining neutrino charges at beam experiments

Jack D. Shergold*

Martin Spinrath†

  • *Contact author: jack.d.shergold@ific.uv.es
  • †Contact author: spinrath@phys.nthu.edu.tw
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Phys. Rev. D 112, 073006 – Published 17 October, 2025

DOI: https://doi.org/10.1103/rnd5-jfvh

Abstract

We propose a new method to constrain neutrino charges at neutrino beam experiments. Uncharged in the Standard Model, evidence for a neutrino electric charge would be a smoking gun for new physics, shedding light on the Dirac or Majorana nature of neutrinos, and giving insight into the origin of charge quantization. We find that using the most sensitive magnetometers available, existing beam experiments could constrain neutrino charges |qν|≲10−13, in units of the electron charge, while future upgrades could strengthen these bounds significantly. We also discuss electromagnetic dipole moments and show that our proposal is highly sensitive to new long-range forces.

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Phys. Rev. D 112, 073006– Published 17 October, 2025
  • Received 23 December 2024
  • Accepted 15 September 2025
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