Search for Matter-Dependent Atmospheric Neutrino Oscillations in Super-Kamiokande

Details Search for Matter-Dependent Atmospheric Neutrino Oscillations in Super-Kamiokande Search for Matter-Dependent Atmospheric Neutrino Oscillations in Super-Kamiokande

2008-01-05

arxiv.org/abs/0801.0776v1

Phys.Rev.D77:052001,2008

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 1 figure

Scientific paper

10.1103/PhysRevD.77.052001

We consider muon neutrino to tau neutrino oscillations in the context of the Mass Varying Neutrino (MaVaN) model, where the neutrino mass can vary depending on the electron density along the flight path of the neutrino. Our analysis assumes a mechanism with dependence only upon the electron density, hence ordinary matter density, of the medium through which the neutrino travels. Fully-contained, partially-contained and upward-going muon atmospheric neutrino data from the Super--Kamiokande detector, taken from the entire SK--I period of 1489 live days, are compared to MaVaN model predictions. We find that, for the case of 2-flavor oscillations, and for the specific models tested, oscillation independent of electron density is favored over density dependence. Assuming maximal mixing, the best-fit case and the density-independent case do not differ significantly.

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