Solar neutrinos enable self-calibration of the ν_e + 40Ar cross section to ≲2% in 9-15 MeV via known 8B flux, survival probability, and distinctive Fermi/Gamow-Teller angular distributions.
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Supervised ML classification of neutrino events by interaction channel prior to energy reconstruction improves accuracy and sensitivity by 10-20% in simulated DUNE analyses while remaining robust to generator mismodeling.
Hybrid HF-CRPA calculations predict lower allowed cross sections for charged-current ν_e on 40Ar at low energies, leading to ~20% fewer events in DUNE for a galactic supernova burst than the prior MARLEY model.