Speaker
Description
The seesaw models can naturally explain the neutrino masses and the matter-antimatter asymmetry of our universe. The seesaw scale is usually very high and one can integrate out the heavy degrees of freedom to obtain the seesaw effective field theory (SEFT). We establish the connection between the full seesaw model and the low-energy SEFT from a complete new point of view: the invariant theory. Using the tool of Hilbert series, we demonstrate the intimate relation between the flavor space of the SEFT and that of its ultraviolet theory. Through a proper matching procedure of flavor invariants, the CP asymmetries necessary for successful leptogenesis are directly linked to those in neutrino-neutrino and neutrino-antineutrino oscillations at low energies. Surprisingly, it is revealed that the precise measurements of dimension-five and dimension-six operators in low-energy experiments are powerful enough to probe the full seesaw model, including CP violation for cosmological matter-antimatter asymmetry.
