Speaker: Daniel Egana-Ugrinovic , Rutgers

When: September 23, 2015 (Wed), 03:30PM to 04:30PM (add to my calendar)
Location: PRB 595

This event is part of the HET Seminar Series.

We present a supersymmetric model in which the origin of all CP violation and flavor mixing is contained in the setup of an SU(5) unified Nelson-Barr mechanism, which solves the strong CP problem. The scale of spontaneous CP breaking is taken to be larger than the right handed (RH) neutrino masses to allow for thermal leptogenesis. Supersymmetry protects the strong CP phase from dangerous contributions induced by the large CP breaking scale. The low energy theory is a supersymmetric type I seesaw model, with all flavor mixing and CP violating effects contained in a wave function renormalization matrix. The model is able to accommodate the measured neutrino mass splittings and mixing angles. The model gives as an output the CP violating phases in the PMNS matrix, a normal neutrino mass hierarchy and the lightest neutrino mass to be around $10^{-2}−10^{−3}$ eV . The observed baryon asymmetry is obtained through thermal leptogenesis for a RH neutrino mass $M_1 \gtrsm 10^{11} GeV$ . Numerical calculations are considerably simplified by making use of flavor invariants.