Davide Meloni, Rome [HET Seminar] "Theoretical explorations of neutral lepton properties"

Thursday 19 Nov 2026, 10:30 → 12:30 US/Eastern

Small Seminar Room

The precision reached in neutrino oscillation measurements sharpens the question of why lepton masses and mixing differ so markedly from those of quarks. I discuss here three complementary approaches to the flavour problem: non-Abelian discrete symmetries, modular invariance, and quark–lepton mixing relations. Simple mixing textures provide useful leading order descriptions, but require controlled corrections, in particular to account for the nonzero reactor angle. Modular invariance constrains Yukawa couplings through their dependence on a complex modulus and offers a different organisation of flavour breaking. Finally, CKM-related constructions illustrate how a Cabibbo-sized contribution to lepton mixing can emerge, while also exposing the additional assumptions required to connect the two sectors.

 

https://bnl.zoomgov.com/j/1653048131?pwd=fkT0TgSQn5wqXX55rQa3jABDwMj8sE.1