Four-Neutrino Oscillations at SNO

Abstract

We discuss the potential of SNO to constraint the four-neutrino mixing schemes favoured by the results of all neutrino oscillations experiments. These schemes allow simultaneous transitions of solar ${\nu }_e^{\prime }s$ into active ${\nu }_{\mu }$'s, ${\nu }_{\tau }$'s and sterile ${\nu }_s$ controlled by the additional parameter ${\cos }^2({\vartheta }_{23}){\cos }^2({\vartheta }_{24})$ and they contain as limiting cases the pure ${\nu }_e$-active and ${\nu }_e$-sterile neutrino oscillations. We first obtain the solutions allowed by the existing data in the framework of the BP00 standard solar model and quantify the corresponding predictions for the CC and the NC/CC event ratios at SNO for the different allowed regions as a function of the active-sterile admixture. Our results show that some information on the value of ${\cos }^2({\vartheta }_{23}){\cos }^2({\vartheta }_{24})$ can be obtained by the first SNO measurement of the CC ratio, while considerable improvement on the knowledge of this mixing will be achievable after the measurement of the NC/CC ratio.

17 pages,latex file using RevTex. 6 postscript figures. Corrected figure 2. PRD63, 73013 (2001)

References in corpus (8)

• The Dark Side of the Solar Neutrino Parameter Space
• Neutrino Reactions on Deuteron
• Fate of the Sterile Neutrino
• Four--Neutrino Oscillation Solutions of the Solar Neutrino Problem
• Phenomenology of Maximal and Near-Maximal Lepton Mixing
• Day - Night Effect Predictions for the SNO Detector
• Correlations of Solar Neutrino Observables for SNO
• Day-night asymmetry of high and low energy solar neutrino events in Super-Kamiokande and in the Sudbury Neutrino Observatory

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• Neutrino Mass Spectrum and Future Beta Decay Experiments
• Robust signatures of solar neutrino oscillation solutions
• Solar and Atmospheric Four-Neutrino Oscillations
• MSW mediated neutrino decay and the solar neutrino problem
• Super-Kamiokande atmospheric neutrinos: Status of subdominant oscillations
• Zenith angle distributions at Super-Kamiokande and SNO and the solution of the solar neutrino problem
• Telling three from four neutrinos at the Neutrino Factory
• Large lepton mixing and supernova 1987A
• Solar neutrino event spectra: Tuning SNO to equalize Super-Kamiokande
• Revisiting pseudo-Dirac neutrinos
• Atmospheric neutrinos as a probe of eV^2-scale active-sterile oscillations
• Earth Regeneration of Solar Neutrinos at SNO and Super-Kamiokande
• Optimization of Neutrino Oscillation Parameters using Differential Evolution