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arXiv · 2506.04099

Heavy Neutral Lepton Decay Searches using Solar Neutrinos

Patrick Huber·Yulun Li
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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 predicitions 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.

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Patrick Huber, Yulun Li. 2025-06-04. Heavy Neutral Lepton Decay Searches using Solar Neutrinos. https://arxiv.org/abs/2506.04099

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