Measurements of transverse kinematic imbalance in muon neutrino charged-current interactions on argon with a single proton and no pions in the final state with SBND
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R. Acciarri, L. Aliaga-Soplin, D. Andrade Aldana, C. Andreopoulos, A. Antonakis, S. Balasubramanian et al. · arXiv: 2610.39042v1 · Summary page
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Argon exposes gaps in neutrino simulations
The Short-Baseline Near Detector reports its first neutrino–argon cross-section measurement. The analysis selects interactions producing a muon and a single proton, with no pions in the final state, then examines how their momenta fail to balance transverse to the incoming neutrino direction. That imbalance probes the nuclear processes hidden inside what might otherwise look like a simple collision.
The data distinguish strongly among event-generator predictions, but none of the compared models describes all the measured variables successfully. The largest disagreements concern transverse missing momentum. This is a practical warning for precision neutrino experiments: extracting neutrino properties requires reliable accounts of how neutrinos interact with nuclei, and those accounts still need improvement.
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