Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-08-17
Phys.Lett.B521:299-307,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 3 postscript figures, using elsart.cls. Published version
Scientific paper
10.1016/S0370-2693(01)01231-X
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: $\Delta m^2$, $\mu B_\perp$ and the neutrino mixing angle $\theta$. We show how a rates-only analysis for fixed $\mu B_\perp$ 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.
Miranda Omar Gustavo
Pena-Garay Carlos
Rashba Timur I.
Semikoz Victor B.
Valle Jose W. F.
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