High Energy Theory Seminar

In the Standard Model there are 28 fundamental constants, like the finestructure constant. 22 of these constants are given by the lepton and quark masses, and the related flavor mixing parameters. In the SO(10) Grand Unified Theory one can arrange the fermions such that simple reflection symmetries determine the flavor mixing parameters in terms of the mass eigenvalues. I will discuss the success of such a model for the quarks. I apply the same idea to the leptons. Using the experimental values for the angles, describing the neutrino oscillations, i can calculate the neutrino masses. The are very small. The mass of the third neutrino is 0.05 eV. It will be very difficult to find an effect in the neutrinoless double beta decay. One prediction can soon be checked in the reactor neutrino experiments.