Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-01-10
J.Phys.G29:665-682,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages of REVTEX, 6 figures; several typos are corrected
Scientific paper
10.1088/0954-3899/29/4/305
A global analysis of the data from all the solar neutrino experiments combined with the recent KamLAND data is presented. A formula frequently used in the literature gives survival probability for three active solar neutrino flavors in terms of a suitably-modified two-flavor survival probability. Corrections to this formula, which depend on $\theta_{13}$ and $\delta m_{31}^2$, are calculated. For the mass scale suggested by the atmospheric neutrino experiments the contributions of $\delta m_{31}^2$ to these corrections is found to be negligible. The role of $\theta_{13}$ in solar neutrino physics is elaborated. For electron neutrino oscillations into another active flavor, we find best fit values of $\tan^2 \theta_{12} \sim 0.46$, $\tan^2 \theta_{13} \sim 0$, and $\delta m_{21}^2 \sim 7.1 \times 10^{-5}$ eV$^2$. It is found that the combined solar neutrino and KamLAND date provide the limit $\cos^4 \theta_{13} < 0.8$ at the 90 % confidence level.
Baha Balantekin A.
Yuksel Hasan
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