Abstract
We discuss the possibilities of high precision measurement of the solar neutrino mixing angle in solar and reactor neutrino experiments. The improvements in the determination of , which can be achieved with the expected increase of statistics and reduction of systematic errors in the currently operating solar and KamLAND experiments, are summarized. The potential of LowNu elastic scattering experiment, designed to measure the solar neutrino flux, for high precision determination of , is investigated in detail. The accuracy in the measurement of , which can be achieved in a reactor experiment with a baseline , corresponding to a survival probability minimum (SPMIN), is thoroughly studied. We include the effect of the uncertainty in the value of in the analyses. A LowNu measurement of the neutrino flux with a 1% error would allow to determine with an error of 14% (17%) at from a two-generation (three-generation) analysis. The same parameter can be measured with an uncertainty of 2% (6%) at () in a reactor experiment with , statistics of GWkTy and systematic error of 2%. For the same statistics, the increase of the systematic error from 2% to 5% leads to an increase in the uncertainty in from 6% to 9% at . The inclusion of the uncertainty in the analysis changes the error on to 3% (9%). The effect of uncertainty on the measurement in both types of experiments is considerably smaller than naively expected.
7 More- Received 28 December 2004
DOI:https://doi.org/10.1103/PhysRevD.72.033013
©2005 American Physical Society