This Letter reports new results from the MINOS experiment based on a two-year exposure to muon neutrinos from the Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of neutrino flavor with mass splitting |Δm2|=(2.43±0.13)×10-3eV2 (68 C.L.) and mixing angle sin 2(2θ)>0.90 (90 C.L.). Our data disfavor two alternative explanations for the disappearance of neutrinos in flight: namely, neutrino decays into lighter particles and quantum decoherence of neutrinos, at the 3.7 and 5.7 standard-deviation levels, respectively.
ASJC Scopus subject areas
- Physics and Astronomy(all)