Heavy neutral lepton decay searches using solar neutrinos
Abstract
We study the sensitivity to the decay of a heavy neutral lepton into e + e − -pairs using the solar boron-8 neutrino flux as source. We provide a fully differential cross section for this process including the interference of neutral and charged current amplitudes. We revisit a previous bound from Borexino and make predictions for the expected sensitivity in future large liquid noble gas detectors, like XLZD, Argo, and DUNE, as well as high-resolution scintillator detectors based on the LiquidO technology. We find that more than two orders of magnitude improvement in mixing angle reach is possible relative to existing bounds.
Fields of Study & Subjects
Neutrino Physics Research
Particle physics theoretical and experimental studies
Dark Matter and Cosmic Phenomena
Publication details
- Journal / source
- Physical review. D/Physical review. D.
- Volume
- 113
- Issue
- 1
- Publication date
- 5 January 2026
- Language
- EN