Random magnetic fields inducing solar neutrino spin-flavor precession in a three generation context

Abstract

We study the effect of random magnetic fields in the spin-flavor precession of solar neutrinos in a three generation context, when a non-vanishing transition magnetic moment is assumed between the second and third families. We have analyzed the high energy solar neutrino data and the KamLAND experiment to constrain the solar mixing angle, θ⊙, and solar mass difference, Δm2⊙, and we have found a large shift of allowed values. Also sizable effects in Borexino experiment are expected which can discriminate this scenario and standard Large Mixing Angle (LMA) solution to the solar neutrino problem.