Confronting Spin Flavor Solutions of the Solar Neutrino Problem with current and future solar neutrino data

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  • 26 July 2002
Abstract
A global analysis of spin-flavour precession (SFP) solutions to the solar neutrino problem is given, taking into account the impact of the full set of latest solar neutrino data, including the recent SNO data as well as the 1496--day Super-Kamiokande data. These are characterized by three effective parameters: Delta m^{2}_{Sol} equivalent Delta m^2, the neutrino mixing angle theta_Sol equivalent theta and the magnetic field parameter mu B_{perp}. For the latter we fix mu = 10^{-11} Bohr magneton, with a corresponding optimum self-consistent magneto-hydrodynamics magnetic field profile with maximum strength B_{perp} ~ 80 KGauss in the convective zone. We find that no LOW-quasi-vacuum or vacuum solutions are present at 3 sigma. In addition to the standard LMA oscillation solution, there are two SFP solutions, in the resonant (RSFP) and non-resonant (NRSFP) regimes. These two SFP solutions have goodness of fit 84% (RSFP) and 83% (NRSFP), slightly better than the LMA oscillation solution (78%). We discuss the role of solar anti-neutrino searches in the fit and present a table of best-fit parameters and chi^2_{min} values. Should KamLAND confirm the LMA solution, the SFP solutions may at best be present at a sub-leading level, leading to a constraint on mu B_{perp}. In the event LMA is not the solution realized in nature, then experiments such as Borexino can help distinguishing LMA from the NRSFP solution and the simplest RSFP solution with no mixing.

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