Three-flavor MSW solutions of the solar neutrino problem
- ,
- E. Lisi(,)
- Bari U. and
- INFN, Bari
- ,
- A. Palazzo()
- Bari U. and
- INFN, Bari
33 pages
Published in:
- Phys.Rev.D 62 (2000) 013002
e-Print:
- hep-ph/9912231 [hep-ph]
Report number:
- BARI-TH-365-99
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Abstract:
We perform an updated phenomenological analysis of the Mikheyev-Smirnov-Wolfenstein (MSW) solutions of the solar neutrino problem, assuming oscillations between two and three neutrino families. The analysis includes the total rates of the Homestake, SAGE, GALLEX, Kamiokande and Super-Kamiokande experiments, as well as the day-night asymmetry and the 18-bin energy spectrum of Super-Kamiokande. Solutions are found at several values of the theta_{13} mixing angle. Among the most interesting features, we find that solar neutrino data alone put the constraint theta_{13} < 55--59 deg at 95% C.L., and that a fraction of the MSW solutions extends at and beyond maximal (nu_1,nu_2) mixing (theta_{12} > pi/4), especially if the neutrino square mass splitting is in its lower range (m^2_2-m^2_1 ~ 10^{-7} eV^2) and if theta_{13} is nonzero. In particular, bimaximal (or nearly bimaximal) mixing is possible for atmospheric and MSW solar neutrino oscillations within the stringent reactor bounds on theta_{13}.- neutrino: solar
- neutrino: flux
- neutrino: oscillation
- neutrino: flavor
- flavor: 3
- flavor: 2
- MSW effect
- neutrino: mixing angle
- statistical analysis
- neutrino: cosmic radiation
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