Electron EDM and soft leptogenesis in supersymmetric B–LB–L extension of the Standard Model

We analyze the connection between electric dipole moment of the electron and the soft leptogenesis in supersymmetric B–LB–L extension of the Standard Model. In this model, the B–LB–L symmetry is radiatively broken at TeV scale. Therefore, it is a natural framework for low scale seesaw mechanism and also for implementing the soft leptogenesis. We show that the phases of trilinear soft SUSY breaking couplings A, which are relevant for the lepton asymmetry, are not constrained by the present experimental bounds on electric dipole moment. As in the MSSM extended with right-handed neutrinos, successful leptogenesis requires small bilinear coupling B  , which is now given by ANAN and B–LB–L breaking VEVs. SUSY B–LB–L model with non-universal A  -terms such that AN=0AN=0 while Aν≠0Aν≠0 is a promising scenario for soft leptogenesis. The proposed EDM experiments will test this scenario in the future.