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Small nuclear effects that depend on the lepton mass could change this ratio by a few percent.","posed_since":"","precise":"Determine $\\sigma(\\nu_e)/\\sigma(\\nu_{\\mu})$ and the same for antineutrinos on 40Ar and 16O for $E_{\\nu}=0.3\\ \\text{to}\\ 3\\ \\mathrm{GeV}$ to 2 percent, including lepton-mass effects at low $Q^{2}$, radiative corrections, second-class currents and nuclear-model dependence. The answer is the ratio with an uncertainty budget and a test against a direct measurement.","problem_ref":null,"references":"","settled_by":"A direct $\\nu_{e}$ cross-section measurement on argon or water at the percent level, compared with calculations including radiative corrections.","status_note":"","title":"Electron- to muon-neutrino cross-section ratio on argon and 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