6533b820fe1ef96bd1279afc
RESEARCH PRODUCT
Four-neutrino oscillation solutions of the solar neutrino problem
M. C. Gonzalez-garciaCarlo GiuntiCarlos Pena-garaysubject
Nuclear and High Energy PhysicsSterile neutrinoParticle physicsAstrofísica nuclearSolar neutrinoSolar neutrinosFOS: Physical sciencesAstrophysicsHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)Neutrins solarsCollisions (Nuclear physics)BibliographyNeutrino oscillationMixing (physics)Particles (Nuclear physics)PhysicsAstrophysics (astro-ph)High Energy Physics::PhenomenologyFísicaSolar neutrino problemHigh Energy Physics - PhenomenologyDistribution (mathematics)Col·lisions (Física nuclear)Nuclear astrophysicsHigh Energy Physics::ExperimentGALLEXdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-01-12 |