as i understand it, they were doing experiments to watch how neutrinos change between "electron", "muon" and "tau" flavors. the timing of when the neutrino was

as i understand it, they were doing experiments to watch how neutrinos change between "electron", "muon" and "tau" flavors. the timing of when the neutrino was sent from cern and viewed by the experiment was required to match what the neutrino was before and after.