Constraints on Neutrino Parameters from Neutral-Current Solar Neutrino Measurements

Abstract

We generalize the pull approach to define the ${\chi }^2$ function to the analysis of the data with correlated statistical errors. We apply this method to the analysis of the Sudbury Neutrino Collaboration data obtained in the salt-phase. In the global analysis of all the solar neutrino and KamLAND data we find the best fit (minimum ${\chi }^2$) values of neutrino parameters to be ${\tan }^2{\theta }_{12}\sim 0.42$ and $\delta m_{12}^2\sim 7.1\times 10^{-5}$ eV${}^2$. We confirm that the maximal mixing is strongly disfavored while the bounds on $\delta m_{12}^2$ are significantly strengthened.

Comments: 6 figures. Some typos are corrected, figures are visually improved