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arXiv · hep-ph/0108145

A non-resonant dark-side solution to the solar neutrino problem

O. G. Miranda·C. Pena-Garay·T. I. Rashba·V. B. Semikoz·J. W. F. Valle
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Abstract

We re-analyse spin-flavour precession solutions to the solar neutrino problem in the light of the recent SNO CC result as well as the 1258--day Super-Kamiokande data and the upper limit on solar anti-neutrinos. In a self-consistent magneto-hydrodynamics approach the resulting scheme has only 3 effective parameters: $Δm^2$, $μB_\perp$ and the neutrino mixing angle $θ$. We show how a rates-only analysis for fixed $μB_\perp$ slightly favours spin-flavour precession (SFP) solutions over oscillations (OSC). In addition to the resonant solution (RSFP for short), there is a new non-resonant solution (NRSFP) in the ``dark-side''. Both RSFP and NRSFP lead to flat recoil energy spectra in excellent agreement with the latest SuperKamiokande data. We also show that in the presence of a neutrino transition magnetic moment of $10^{-11}$ Bohr magneton, a magnetic field of 80 KGauss eliminates all large mixing solutions other than the so-called LMA solution.

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O. G. Miranda, C. Pena-Garay, T. I. Rashba, V. B. Semikoz, J. W. F. Valle. 2001-11-27. A non-resonant dark-side solution to the solar neutrino problem. https://doi.org/10.1016/s0370-2693(01)01231-x

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