Zenith distribution of atmospheric neutrino events and electron neutrino mixing
Abstract
Assuming atmospheric neutrino oscillations with dominant numu<--->nutau transitions, we discuss how subdominant nue mixing (within the Chooz reactor bounds) can alter the zenith distributions of neutrino-induced electrons and muons. We isolate two peculiar distortion effects, one mainly related to nue mixing in vacuum and the other to matter oscillations, that may be sufficiently large to be detected by the SuperKamiokande atmospheric nu experiment. These effects (absent for pure two-flavor numu<--->nutau transitions) do not vanish in the limit of energy-averaged oscillations.
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