Speaker
Serguey Petcov
(Istituto Nazionale di Fisica Nucleare)
Description
In the presence of a finite modular flavour symmetry, fermion mass hierarchies may be
generated by a slight deviation of the modulus from a symmetric point. We point out that
this small parameter governing charged-lepton mass hierarchies may also be responsible
for the breaking of lepton number in a symmetry-protected low-scale seesaw, sourcing
active neutrino masses and the mass splitting of a pseudo-Dirac pair of heavy neutrinos.
We discuss the phenomenological implications of this mechanism,
