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|Title:||Do Two Flavour Oscillations Explain both KamLAND Data and the Solar Neutrino Spectrum?|
|Citation:||INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS,50(5)1515-1521|
|Abstract:||The recent measurement of Delta (sol) by the KamLAND experiment with very small errors, makes definitive predictions for the energy dependence of the solar neutrino survival probability P (ee) . We fix Delta (sol) to be the KamLAND best fit value of 8x10(-5) eV(2) and study the energy dependence of P (ee) for solar neutrinos, in the framework of two flavour oscillations and also of three flavour oscillations. For the case of two flavour oscillations, P (ee) has a measurable slope in the 5-8 MeV range but the solar spectrum measurements in this range find P (ee) to be flat. The predicted values of P (ee) , even for the best fit value of theta (sol) , differ by 2-3 sigma from the Super-K measured values in each of the three energy bins of the 5-8 MeV range. If future measurements of solar neutrinos by Super-K and SNO find a flat spectrum with reduced error bars (by a factor of 2), it will imply that two flavour oscillations can no longer explain both KamLAND data and the solar spectrum. However a flat solar neutrino spectrum and the Delta (sol) measured by KamLAND can be reconciled in a three flavour oscillation framework with a moderate value of theta (13) approximate to 13 degrees.|
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