The reheating era leptogenesis in models with seesaw mechanism

Understand

Observed baryon asymmetry can be achieved not only by the decay of right-handed neutrinos but also by the scattering processes in the reheating era.

• In the latter scenario, new physics in high energy scale does not need to be specified, but only two types of the higher dimensional operator of the standard model particles are assumed in the previous work.
• In this paper, we examine the origin of the higher dimensional operators assuming models with a certain seesaw mechanism at the high energy scale.
• The seesaw mechanism seems to be a simple realization of the reheating era leptogenesis because the lepton number violating interaction is included.