The Dark Side of the Solar Neutrino Parameter Space

Details The Dark Side of the Solar Neutrino Parameter Space The Dark Side of the Solar Neutrino Parameter Space

2000-02-07

arxiv.org/abs/hep-ph/0002064v2

Phys.Lett.B490:125-130,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, uses psfig. Fixed typos in Eq. (3). An imprecise comment in the footnote removed

Scientific paper

10.1016/S0370-2693(00)00989-8

Results of neutrino oscillation experiments have always been presented on the (sin^2 2theta, Delta m^2) parameter space for the case of two-flavor oscillations. We point out, however, that this parameterization misses the half of the parameter space pi/4 < theta <= pi/2 (``the dark side''), which is physically inequivalent to the region 0 <= theta <= pi/4 (``the light side'') in the presence of matter effects. The MSW solutions to the solar neutrino problem can extend to the dark side, especially if we take the conservative attitude to allow higher confidence levels, ignore some of the experimental results in the fits, or relax theoretical predictions. Furthermore even the so-called ``vacuum oscillation'' solution distinguishes the dark and the light sides. We urge experimental collaborations to present their results on the entire parameter space.

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