Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-10-07
Eur.Phys.J.C18:97-106,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 5 figures; Eq. (22) and Ref. [1] corrected
Scientific paper
10.1007/s100520000513
We have analyzed the most recent available Super-Kamiokande data in a three flavor neutrino oscillation model. We have here neglected possible matter effects and performed a fit to atmospheric and solar Super-Kamiokande data. We have investigated a large parameter range, where the mixing angles were restricted to $0 \leq \theta_i \leq \pi/2$, $ i=1,2,3$, and the mass squared differences were taken to be in the intervals $10^{-11} {\rm eV}^2 \leq \Delta m^2 \leq 10^{-2} {\rm eV}^2$ and $10^{-4} {\rm eV}^2 \leq \Delta M^2 \leq 10 {\rm eV}^2$. This yielded a best solution characterized by the parameter values $\theta_1 \simeq 45^\circ$, $\theta_2 \simeq 10^\circ$, $\theta_3 \simeq 45^\circ$, $\Delta m^2 \simeq 4.4 \times 10^{-10} {\rm eV}^2$, and $\Delta M^2 \simeq 1.01 \times 10^{-3} {\rm eV}^2$, which shows that the analyzed experimental data speak in favor of a bimaximal mixing scenario with one of the mass squared differences in the ``just-so'' domain and the other one in the range capable of providing a solution to the atmospheric neutrino problem.
Meier Christoph
Ohlsson Tommy
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