Four-neutrino oscillation solutions of the solar neutrino problem

We present an analysis of the neutrino oscillation solutions of the solar neutrino problem in the framework of four-neutrino mixing where a sterile neutrino is added to the three standard ones. We perform a fit to the full data set corresponding to the 825-day Super-Kamiokande data sample as well as to Chlorine, GALLEX and SAGE and Kamiokande experiments. In our analysis we use all measured total event rates as well as all Super-Kamiokande data on the zenith angle dependence and the recoil electron energy spectrum. We consider both transitions via the Mikheyev-Smirnov-Wolfenstein (MSW) mechanism as well as oscillations in vacuum (just-so) and find the allowed solutions for different values of the additional mixing angles. This framework permits transitions into active or sterile neutrinos controlled by the additional parameter

\cos^2(\vartheta_{23}) \cos^2(\vartheta_{24})

. We discuss the maximum allowed values of this additional mixing parameter for the different solutions.

neutrino: solar
neutrino: oscillation
neutrino: flavor
flavor: 4
neutrino: mixing angle
neutrino: sterile
neutrino: cosmic radiation
neutrino: mass difference
numerical calculations: interpretation of experiments
bibliography

References(101)

Figures(0)

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