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arXiv · 2610.18971

Direct Detection of Solar Neutrinos to Probe Tensions and Break Degeneracies in Long-Baseline Neutrino Experiments

Dorian W. P. Amaral·David Cerdeño·Andrew Cheek·Valeria Costa·Peter B. Denton·Patrick Foldenauer
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Abstract

Long-baseline (LBL) accelerator experiments are sensitive not only to the standard neutrino oscillation parameters but also to new physics. Currently, there exists a tension between NOvA and T2K data that can be explained by vector non-standard neutrino interactions (NSI) with complex couplings, which in turn introduce degeneracies in LBL measurements. We demonstrate that dark matter direct detection experiments can use their measurements of solar neutrinos to test the NSI resolution of this tension and to break these degeneracies. Using recent solar neutrino data from LZ, XENONnT, and PandaX-4T, we show that dark matter direct detection experiments already constrain part of the NSI solution of the NOvA-T2K tension. These experiments can also probe parts of the NSI parameter space that even DUNE will be blind to. Our analysis combines nuclear recoils from $^8$B neutrinos and electron recoils from $pp$ neutrinos. A future xenon experiment, such as XLZD or PandaX-xT, will be able to cover a significant fraction of the NSI solution of the NOvA-T2K tension.

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Dorian W. P. Amaral, David Cerdeño, Andrew Cheek, Valeria Costa, Peter B. Denton, Patrick Foldenauer. 2026-10-13. Direct Detection of Solar Neutrinos to Probe Tensions and Break Degeneracies in Long-Baseline Neutrino Experiments. https://arxiv.org/abs/2610.18971

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