> What's the sterile neutrino the partner to? It would be a very unusual partner that has no concerved quantum numbers, and only mass. A sterile neutrino woul

> What's the sterile neutrino the partner to? It would be a very unusual partner that has no concerved quantum numbers, and only mass. A sterile neutrino would also imply that the neutrino is a Majorana particle (because it would have not quantum numbers that could be "anti").