On the Origin of Neutrino Masses

Understand

We discuss the simplest mechanisms for generating neutrino masses at tree level and one loop level.

• We find a significant number of new possibilities where one can generate neutrino masses at the one-loop level by adding only two new types of representations.
• These models have renormalizable interactions that automatically conserve baryon number.
• Adding to the minimal standard model a scalar color octet with SU(3) X SU(2) X U(1) quantum numbers, (8,2,1/2), and a fermionic color octet in the fundamental or adjoint representation of SU(2) one can generate neutrino masses in agreement with the experiment.