Leptogenesis in a dynamical seesaw model for right-handed neutrino masses

Details

Supervisors

Pascoli, Silvia ; Degrande, Céline

Faculty

Faculté des sciences

Degree label

Master [120] en sciences physiques, à finalité approfondie

Abstract

The recent discoveries of neutrino oscillations imply neutrinos to be massive. By introducing right-handed neutrinos, the seesaw model gives an attracting way to generate mass to light neutrinos. Too massive to have already been detected, they can also explain the smallness of light neutrino masses. In addition, right-handed neutrinos give an attracting way to explain other fundamental problems of modern physics. They could indeed be at the origin of the generation of the matter-antimatter asymmetry in the universe, well-established in our current understanding of the universe. The minimal SM extension with right-handed neutrinos, nuMSM, have the propriety to break lepton number. Before their introduction, lepton number was an accidental symmetry of the Standard Model. We propose in this thesis to consider this symmetry as fundamental and impose it to right-handed neutrinos. It appears that it can be done by extending the seesaw mechanism in a dynamical way. Doing so, we make appear new interactions with right-handed neutrinos. After having introduced the new dynamical seesaw mechanism, we propose, in this thesis, to study the impacts of these new interactions on leptogenesis.