Earth Regeneration of Solar Neutrinos at SNO and Super-Kamiokande

Abstract

We analyze the 1258-day Super-Kamiokande day and night solar neutrino energy spectra with various ${\chi }^2$ definitions. The best-fit lies in the LMA region at $(\Delta m^2,ta{n}^2\theta )=(5.01\times 10^{-5}e{V}^2,0.60)$, independently of whether systematic errors are included in the ${\chi }^2$-definition. We compare the exclusion and allowed regions from the different definitions and choose the most suitable definition to predict the regions from SNO at the end of three years of data accumulation. We first work under the assumption that Super-Kamiokande sees a flux-suppressed flat energy spectrum. Then, we consider the possibility of each one of the three MSW regions being the solution to the solar neutrino problem. We find that the exclusion and allowed regions for the flat spectrum hypothesis and the LMA and LOW solutions are alike. In three years, we expect SNO to find very similar regions to that obtained by Super-Kamiokande. We evaluate whether the zenith angle distribution at SNO with optimum binning will add anything to the analysis of the day and night spectra; for comparison, we show the results of our analysis of the 1258-day zenith angle distribution from Super-Kamiokande, for which the best-fit parameters are $(\Delta m^2,ta{n}^2\theta )=(5.01\times 10^{-5}e{V}^2,0.56)$.

Minor changes to the text and references

References in corpus (6)

• Solar 8B and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data
• Constraints on Neutrino Oscillations Using 1258 Days of Super-Kamiokande Solar Neutrino Data
• Non-adiabatic Level Crossing in Resonant Neutrino Oscillations
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Cited by in corpus (8)

• Recent Progress in Neutrino Factory and Muon Collider Research within the Muon Collaboration
• Imprint of SNO neutral current data on the solar neutrino problem
• Robust signatures of solar neutrino oscillation solutions
• Neutrino oscillations in low density medium
• A precise analytical description of the Earth matter effect on oscillations of low energy neutrinos
• Nonstandard interactions in solar neutrino oscillations with Hyper-Kamiokande and JUNO
• Model for fermion mass matrices and the origin of quark-lepton symmetry
• Solar Neutrino Zenith Angle Distribution and Uncertainty in Earth Matter Density