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Long-Baseline Neutrino Experiments March On

I n 1998, researchers discovered that neutrinos can change their “flavor” as they travel. This behavior is only possible if neutrinos have a mass—contrary to the initial assumption of the standard model of particle physics. The discovery of this beyond-standard-model behavior, recognized by the 2015 Nobel Prize in Physics, drove intense efforts to characterize neutrino oscillations through increasingly accurate experiments. One such effort, the NOvA experiment at Fermilab, now reports the analysis of oscillation data collected