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Reanalysis of bubble chamber measurements of muon-neutrino induced single pion production

There exists a longstanding disagreement between bubble chamber measurements of the single pion production channel $ν_μp\rightarrow μ^{-}pπ^{+}$ from the Argonne and Brookhaven National Laboratories. We digitize and reanalyse data from both experiments to produce cross-section ratios for various interaction channels, for which the flux uncertainties cancel, and find good agreement between the experiments. By multiplying the cross-section ratio by the well-understood charged current quasi-elastic cross-section on free nucleons, we extract single-pion production cross-sections which do not depend on the flux normalization predictions. The $ν_μp\rightarrow μ^{-}pπ^{+}$ cross-sections we extract show good agreement between the ANL and BNL datasets.