Atmospheric neutrino oscillations in three-flavor neutrinos. 2

We analyze the atmospheric neutrino experiments of SuperKamiokande (535 days) using the three-flavor neutrino framework with the mass hierarchy m1 approx. = m2 << m3. We study the event ratios of sub-GeV, multi-GeV and upward through-going muons zenith angle distributions. Taking into account atmospheric and terrestrial experiments, we obtain the allowed regions of mass and mixing parameters Δm122, sin2 2θ12, Δm232, θ13 and θ23. The mass parameter Δm232 is restricted to 0.01 eV2 - 0.0002 eV2. For mixing parameters, there is no difference between the large θ12 angle solution and the small one, and θ13 < 13deg, 28deg < θ23 < 37deg and 53deg < θ23 < 62deg for Δm232 = 0.01 eV2, θ13 < 23deg and 29deg < θ23 < 61deg for Δm232 0.002 eV2, 4deg < θ13 < 22deg and 38deg < θ23 < 54deg for Δm232 = 0.0002 eV2. (author)