Before and after: How has the SNO neutral current measurement changed things?

2002 
We present \Before and After" global oscillation solutions, as well as pre- dicted \Before and After" values and ranges for ten future solar neutrino observables (for BOREXINO, KamLAND, SNO, and a generic p-p neutrino detector). The \Before" case includes all solar neutrino data (and some theoretical improvements) available prior to April 20, 2002 and the \After" case includes, in addition, the new SNO data on the CC, NC, and day-night asymmetry. We have performed global analyses using the full SNO day-night energy spectrum and, alternatively, using just the SNO NC and CC rates and the day-night asymmetry. The LMA solution is the only currently allowed MSW oscillation solution at » 99% CL. The LOW solution is allowed only at more than 2:5ae, SMA is now excluded at 3:7ae or 4:7ae depending upon analysis strategy, and pure sterile oscillations are excluded at more than 4:7ae. Small mixing angles are \out" (pure sterile is \way out"); MSW with large mixing angles is deflnitely \in." Vacuum oscillations are allowed at 3ae, but not at 2ae. Precise maximal mixing is excluded at 3:2ae for MSW solutions and at more than 2:8ae for vacuum solutions. Most of the predicted values for future observables for the BOREXINO, KamLAND, and future SNO measurements are changed only by minor amounts by the inclusion of the recent SNO data. In order to test the robustness of the allowed neutrino oscillation regions that are inferred from the measurements and the pre- dicted values for future solar neutrino observables, we have carried out calculations using a variety of strategies for analyzing the SNO and other experimental data.
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