Uniting Low-Scale Leptogenesis Mechanisms

In this Letter we demonstrate that what was previously considered as different mechanisms of baryon asymmetry generation involving two right-handed Majorana neutrinos with masses far below the Grand Unified Theory scale-leptogenesis via neutrino oscillations and resonant leptogenesis-are actually united. We show that the observed baryon asymmetry can be generated for all experimentally allowed values of the right-handed neutrino masses above M-N greater than or similar to 100 MeV. Leptogenesis is effective in a broad range of the parameters, including mass splitting between two right-handed neutrinos as big as Delta M-N / M-N similar to 0.1, as well as mixing angles between the heavy and light neutrinos large enough to be accessible to planned intensity experiments or future colliders.

Automated summary

In this paper, it is demonstrated that previously considered different mechanisms of baryon asymmetry generation involving two right-handed Majorana neutrinos are actually united. The study shows that the observed baryon asymmetry can be generated for all experimentally allowed values of the right-handed neutrino masses above 100 MeV, with effective leptogenesis in a broad range of parameters.