Implications of recent solar neutrino observations: an analysis of charged current data

Abstract

We have analyzed the recent results from the observation of charged current ν_ed^→e^-pp events from solar neutrinos by the Sudbury Neutrino Observatory (SNO) assuming neutrino oscillations with three active flavors. The data seem to prefer a low mass-squared difference and large mixing angle solution (the so-called LOW solution) in (12) parameter space. However, when combined with the gallium charged current interaction data from GALLEX and GNO, distinct (1σ) allowed regions corresponding to the large mixing angle (LMA) and small mixing angle (SMA) appear while the LOW solution is disfavored up to 3σ standard deviation. The physical electron neutrino survival probability corresponding to these best fit solutions are then determined and analyzed for their energy dependence.