As far as I know, the anihilation of an electron by a positron is an electromagnetic process described by QED. Neutrinos, however, do not participate in the elektromagnetic interaction. Does that mean a Antineutrino will not anihilate a Neutrino of the same kind? Is there an interaction between Neutrino and Antineutrinofields and how does it look like? Maybe the weak interaction can also cause anihilation processes?