Predicting neutrino parameters in seesaw scenarios

by Alejandro Ibarra (CERN-TH)

Friday 5 Dec 2003, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

The seesaw mechanism is perhaps the most attractive scenario to explain the small neutrino masses. However, at high energies it is defined by more parameters than it is possible to measure at low energies, resulting in a lack of predictability. In this talk I will review some frameworks where, using some well motivated hypotheses about the high energy physics, the seesaw mechanism does give predictions for some low energy observables. In particular, I will derive a leptonic version of the Gatto-Sartori-Tonin relation, and I will discuss the scenario with two right-handed neutrinos. The implications of these frameworks for the leptogenesis scenario and the connection with the low-energy physics will also be discussed.