Piecing the Solar Neutrino Puzzle Together at SNO

We perform an oscillation parameter-independent analysis of solar neutrino flux measurements from which we predict the charged-current rate at SNO relative to Standard Solar Model to be R SNO = 0.35 +0.16 −0.09(0.46 +0.13 −0.11) for oscillations to active (sterile) neutrinos. By alternately considering the B flux normalization fixed and free, we find that the flux measured by SuperKamiokande (SK) not being a result of oscillations is strongly disfavored. SNO will determine the best-fit value of the B flux normalization β (equal to the neutral-current rate), without recourse to neutral-current measurements, from the derived relation β = R SNO = 5.85RSK − 4.85R SNO. Using a simple parameterization of the fraction of high, intermediate, and low energy solar neutrinos starting above resonance, we reproduce the results of global analyses to good accuracy; we find that the LMA solution with a normal mass hierarchy is clearly favored. With β free, our analysis for oscillations to active neutrinos gives R SNO = β = 1.34 ± 0.34, which corresponds to R SNO = 0.28 ± 0.07.