The survival probability of muon neutrinos was analyzed as a function of L/E using atmospheric neutrino events observed in Super-Kamiokande. Alternative models that could explain the zenith angle and energy dependent deficit of the atmospheric muon neutrinos were disfavored. The neutrino energy was estimated from the total energy of charged particles observed in the inner detector (ID). It was concluded that the observed L/E distribution gives the first direct evidence that the neutrino survival probability obeys the sinusoidal function as predicted by neutrino flavor oscillations.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)