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Four-neutrino oscillation solutions of the solar neutrino problem
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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.
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GIUNTI, Carlo, GONZÁLEZ GARCÍA, Ma. Concepción and PEÑA GARAY, Carlos. Four-neutrino oscillation solutions of the solar neutrino problem. Physical Review D. 2000. Vol. 62, num. 1, pags. 013005-1-013005-13. ISSN 0556-2821. [consulted: 5 of October of 2026]. Available at: https://hdl.handle.net/2445/12504