Frequentist analyses of solar neutrino data (updated including KamLAND and SNO data)
Paolo Creminelli, Giovanni Signorelli, Alessandro Strumia
Abstract
The solar neutrino data are analyzed in a frequentist framework, using the Crow-Gardner and Feldman-Cousins prescriptions for the construction of confidence regions. Including in the fit only the total rates measured by the various experiments, both methods give results similar to the commonly used Delta chi2-cut approximation. When fitting the full data set, the Delta chi2-cut still gives a good approximation of the Feldman-Cousins regions. However, a careful statistical analysis significantly reduces the goodness-of-fit of the SMA and LOW solutions. In the addenda we discuss the implications of the latest KamLAND, SNO and SK data.
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