Speaker
Morimitsu Tanimoto
(Niigata University)
Description
CP invariance is a very attractive solution to the strong CP problem in QCD. This solution requires the vanishing phase of (det M_d det M_u) of the mass matrices for the down- and up-type quarks. It happens if we have several zeros in the quark mass matrices. We proceed a systematic construction of texture zeros for the quark sector in the T^2/Z3 orbifold compactification. We also extend the mass construction to the neutrino sector and derive predictions on the CP violating parameter in the neutrino oscillation and the mass parameter of neutrinoless double beta decay. We can naturally explain the positive sign of the baryon asymmetry in the present universe.
