Time and date: Tuesday November 17th @ 16:00 (CET)
Speaker: Juraj Klaric (EPFL)
Title: Uniting low-scale leptogeneses
Abstract: The origin of the light neutrino masses and the baryon asymmetry of the Universe remain some of the biggest open questions of particle physics. Both of these problems can be solved if we extend the standard model by two right-handed neutrinos. The light neutrino masses can be generated through the type-I seesaw mechanism, and the baryon asymmetry of the Universe through leptogenesis. In this talk we will demonstrate that what was previously considered as different mechanisms of baryon asymmetry generation involving two right-handed Majorana neutrinos with masses far below the GUT 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 ~100 MeV. We will also show that leptogenesis is effective in a broad range of the parameters, including mass splitting between two right-handed neutrinos as big as ∆M/M ∼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.