Abstract
We report on the results of a three-flavor oscillation analysis using Super-Kamiokande I atmospheric neutrino data, with the assumption of one mass scale dominance (). No significant flux change due to matter effect, which occurs when neutrinos propagate inside the Earth for , has been seen either in a multi-GeV -rich sample or in a -rich sample. Both normal and inverted mass hierarchy hypotheses are tested and both are consistent with observation. Using Super-Kamiokande data only, 2-dimensional 90% confidence allowed regions are obtained: mixing angles are constrained to and for the normal mass hierarchy. Weaker constraints, and , are obtained for the inverted mass hierarchy case.
- Received 5 April 2006
DOI:https://doi.org/10.1103/PhysRevD.74.032002
©2006 American Physical Society