On the origin of neutrino mass and mixing in the Standard Model

by Bob McElrath (UC-Davis)

Friday 2 Oct 2009, 11:30 → 12:30 Europe/Zurich

Univ. de Geneve, Auditoire 234

One can describe cosmological relic neutrinos by adding Lagrange multipliers to the Standard Model Lagrangian for them. The two possible Lagrange multipliers are a chemical potential, which fixes the mean neutrino/anti-neutrino asymmetry, and a Majorana mass, which fixes the mean spin-entropy. Neutrinos are Majorana in the Standard Model due to the presence of relics. Furthermore we show that by considering their self-interactions and one-loop corrections to their self-energy mediated by Z bosons, the Standard Model has tri-bimaximal mixing of neutrinos.