Leptogenesis, Z' bosons and the reheating temperature of the Universe

por Juan Racker (Universidad de Barcelona)

miércoles 11 mar. 2009 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

Leptogenesis is an attractive theory to explain the origin of the matter-antimatter asymmetry of the universe because it's based on a simple extension of the Standard Model which also allows to understand why the neutrinomasses are so tiny. In leptogenesis scenarios a lepton asymmetry is produced in the out of equilibrium decay of heavy Majorana neutrinos in the early universe, which is then partially converted into a baryon asymmetry by the action of non perturbative processes of the Standard Model. In this talk we will describe the impact for leptogenesis of new U(1) gauge bosons coupled to the heavy Majorana neutrinos. We will show how the allowed region of the parameter space is modified in the presence of Z' bosons and we will comment on the minimum reheating temperature that is required for these models to be successful.