Konwersatorium im. Leopolda Infelda

The fact that our Universe is matter-antimatter asymmetric is generally regarded as a problem for the Standard Model of particle physics, which must be solved by some new physics beyond the one we presently observe at colliders. Indeed, while all ingredients needed to dynamically generate a matter (or baryon) asymmetry are present in the Standard Model, the corresponding mechanism, known as electroweak baryogenesis, fails to produce the observed value. One must therefore appeal to an alternative mechanism relying on new physics beyond the Standard Model. Among various possibilities, a very interesting one is the leptogenesis scenario, which nicely connects the baryon asymmetry of the Universe to the observed neutrino oscillations.