Abstract
We propose a scenario for the generation of baryon number asymmetry based on the inflaton decay in a radiative neutrino mass model extended with singlet scalars. In this scenario, lepton number asymmetry is produced through the decay of non-thermal right-handed neutrinos caused from the inflaton decay. Since the amount of non-thermal right-handed neutrinos could be much larger than the thermal ones, the scenario could work without any resonance effect for rather low reheating temperature. Sufficient baryon number asymmetry can be generated for much lighter right-handed neutrinos compared with the Davidson-Ibarra bound.
Highlights
CMB observations suggest that there is an inflationary expansion era in the early Universe [1]
We have proposed a scenario for the generation of the baryon number asymmetry in a oneloop radiative neutrino mass model extended by the singlet scalars
Leptogenesis is caused by the decay of non-thermal right-handed neutrinos which is produced through the decay of inflaton
Summary
CMB observations suggest that there is an inflationary expansion era in the early Universe [1]. In the effective model which is obtained after the inflaton is integrated out, its remnant is expected to be kept as effective interactions among the SM contents or additional fields at low energy regions Since such interactions could be constrained by weak scale experiments or be detected as some new physics at that scale, their study is useful for the model building beyond the SM. Sneutrino Nhas a coupling Nl ̄φ, where l and φare the ordinary doublet lepton and a fermionic superpartner of the doublet Higgs scalar φ, respectively In this model, reheating after the inflation and the associated generation of lepton number asymmetry due to this coupling has been studied in several articles [4]. We focus our study on such a model and propose a possible new scenario for the generation of the baryon number asymmetry through the reheating due to the above mentioned coupling
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