ABSTRACT
We consider the effect that flavor-nondiagonal neutrino interactions with matter have on the resonant ν oscillations. It is shown that, even in the absence of ν mixing in a vacuum, an efficient conversion of the electron neutnnos from the Sun to another ν flavor can result if the strength of this interaction is — 10-2 GF . We show how this can be implemented in the minimal supcrsymmetric standard model with R-parity breaking. Here, the L-violating couplings induce neutrino masses, mixings, and the flavor-nondiagonal neutnno interactions that can provide a Mikheyev-Smirnov-Wolfenstem-like solution to the solar-neutrino problem even for negligible vacuum mixings.
