Solar and Atmospheric Four-Neutrino Oscillations
Loading...
Date
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Description
We present an analysis of the neutrino oscillation solutions of the solar and atmospheric neutrino problems in the framework of four-neutrino mixing where a sterile neutrino is added to the three standard ones and the mass spectra presents two separated doublets. Such scenarios allow for simultaneous transitions of solar $ν_e$, as well as atmospheric $ν_μ$, into active and sterile neutrinos controlled by the additional mixing angles $\vartheta_{23}$ and $\vartheta_{24}$, and they contain as limiting cases the pure solar $ν_e$-active and $ν_e$-sterile neutrino oscillations, and the pure atmospheric $ν_μ\toν_s$ and $ν_μ\toν_τ$ oscillations, respectively. We evaluate the allowed active-sterile admixture in both solar and atmospheric oscillations from the combined analysis. Our results show that, although the Super-Kamiokande data disfavour both the pure $ν_μ\toν_s$ atmospheric channel and the pure $ν_e\toν_s$ solar channel, the result from the combined analysis still favours close-to-pure active and sterile oscillations and disfavours oscillations into a near-maximal active-sterile admixture.
ReVTeX, 22 pages, 7 Figures. Some typos corrected
ReVTeX, 22 pages, 7 Figures. Some typos corrected