Lepto-axiogenesis in minimal SUSY KSVZ model

We study the lepto-axiogenesis scenario in the minimal supersymmetric KSVZ axion model. Only one Peccei-Quinn (PQ) field and vector-like fields are introduced besides the MSSM with the type-I see-saw mechanism. The PQ field is stabilized by the radiative correction induced by the Yukawa couplings with the vector-like fields introduced in the KSVZ model. We develop a way to follow the dynamics of the PQ field, in particular we found a semi-analytical solution which describes the rotational motion under the logarithmic potential with including the thermalization effect via the gluon scattering which preserves the PQ symmetry. Based on the solution, we studied the baryon asymmetry, the effective number of neutrino, and the dark matter density composed of the axion and the neutralino. We found that the baryon asymmetry is successfully explained when the mass of PQ field is O(10(6) GeV) (O(10(5) GeV)) with the power of the PQ breaking term being 10 (8).

Automated summary

In this study, the lepto-axiogenesis scenario in the minimal supersymmetric KSVZ axion model was investigated. By introducing only one Peccei-Quinn (PQ) field and vector-like fields with Yukawa couplings, the PQ field was stabilized by radiative correction. The dynamics of the PQ field, including rotational motion under logarithmic potential and thermalization effect via gluon scattering, was analyzed. The baryon asymmetry, effective number of neutrinos, and dark matter density composed of axion and neutralino were also studied.