Solar neutrino oscillation parameters and survival probability obtained from the combined low energy threshold analysis at the Sudbury Neutrino Observatory

The SNO Collaboration has reanalyzed the data from the first two phases of the experiment - the pure heavy water and salt phases - in order to extend the observed kinetic energy spectra of neutral- and charged-currents, and elastic scattering events down to as low as 3.5 MeV. The combined nature of the analysis, with the reassessment of the systematics and backgrounds, has improved the neutral-current flux determination of 8B solar neutrinos. In the context of the solar standard model (SSM) and neutrino oscillation theories, the newest SNO results are of great importance in understanding the energy production in the Sun and the interaction of neutrinos with matter. In particular, the absolute 8B flux scale and survival probability are measured, and the parameters of the various models, such as the SSM and matter-enhanced neutrino oscillations with and without the effect of $\theta_{13}$, constrained. Finally the analysis is repeated by combining a collection of results from solar and reactor experiments with the SNO data to obtain a global estimation of the neutrino mixing parameters.