We compute up-down asymmetries for atmospheric neutrino induced electron and muon events in the SuperKamiokande detector for the following neutrino oscillation models: (A) maximally mixed $\nu_{ \mu} - \nu_{ \tau}$ or $\nu_{ \mu} - \nu_s$, (B) maximally mixed $\nu_{ \mu} - \nu_e$, (C) threefold maximal mixing between $\nu_e, \nu_{ \mu}$ and $\nu_{ \tau}$, and (D) neutrino oscillations via Equivalence Principle or Lorentz invariance violation. We emphasise the role of different momentum cuts.
Categories: hep-ph