Bridging resonant leptogenesis and low-energy CP violation with an RGE-modified seesaw relation

Abstract

We propose a special type-I seesaw scenario in which the Yukawa coupling matrix Yν can be fully reconstructed by using the light Majorana neutrino masses mi, the heavy Majorana neutrino masses Mi and the PMNS lepton flavor mixing matrix U. It is the RGE-induced correction to the seesaw relation that helps interpret the observed baryon-antibaryon asymmetry of the Universe via flavored resonant thermal leptogenesis with M1≃M2≪M3. We show that our idea works well in either the τ-flavored regime with equilibrium temperature T≃M1∈(109,1012] GeV or the (μ+τ)-flavored regime with T≃M1∈(105,109] GeV, provided the light neutrinos have a normal mass ordering. We find that the same idea is also viable for a minimal type-I seesaw model with two nearly degenerate heavy Majorana neutrinos.