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Neutrino magnetic dipole portal with low energy neutrino nucleus scattering data

Ying-Ying Li1,2,3,*, Yu-Feng Li1,4,†, and Shuo-Yu Xia1,4,‡

  • *Contact author: liyingying@ihep.ac.cn
  • †Contact author: liyufeng@ihep.ac.cn
  • ‡Contact author: xiashuoyu@ihep.ac.cn

Phys. Rev. D 113, 053011 – Published 31 March, 2026

DOI: https://doi.org/10.1103/fsng-tx27

Abstract

We scrutinize neutrino magnetic dipole portals of sterile neutrinos in the mass range of 0.1–50 MeV through the nuclear and electron recoils at neutrino scattering experiments. For the e-flavor dipole portal, we show that Dresden-II can provide leading constraints for mN≲0.5  MeV, setting aside unresolved theoretical uncertainties. For the μ-flavor case, we employ a two-dimensional fitting method which could utilize the timing structure measurement of the full dataset collected by the CsI[Na] scintillation detector. With such, we demonstrate that the COHERENT experiment can probe a wide unique parameter region for mN in the range of 10–40 MeV. Exclusion regions for τ-flavor dipole portal based on latest measurements of the solar neutrino from dark matter direct detection experiments are also presented.

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