Imprint of SNO neutral current data on the solar neutrino problem

  • 22 April 2002
Abstract
We perform a global analysis in the framework of two active neutrino oscillations of all solar neutrino data, including the recent SNO neutral-current (NC) rate and charged-current (CC) day-night asymmetry measurements, the Super-Kamiokande (SK) 1496-day day and night spectra and the updated SNO CC and SAGE results. We find that the Large Mixing Angle (LMA) solution is selected at the 90% C.L.; the best-fit parameters are \Delta m^2=5.0 \times 10^{-5} eV^2 and \theta=32^{\circ}. However, the low \Delta m^2 (LOW) solution is also viable, with a 0.89 goodness of fit. No solutions with $\theta>\pi/4$ are allowed at the 3\sigma C.L. Oscillations to a pure sterile state are excluded at 5.3\sigma, but a sizeable sterile neutrino component could still be present in the solar flux.

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