Speaker
Description
I will present a study of quark and lepton masses in a universal seesaw
with modular A4 symmetry. Light fermion masses arise from mixing with
heavy vector-like partners. A SUSY setup with gCP and minimal Z2 is
adopted in this model. The global fit uses 17 parameters in total—the
complex τ plus 15 real parameters—to describe 18 observed quantities
across the CKM and PMNS sectors. The fitted observables agree well with
current measurements, demonstrating that the model can account for both
CKM and PMNS patterns without extra flavons. This framework yields
predictions for the leptonic Dirac phase δCP, the two Majorana phases, the
effective neutrinoless double-beta mass mee, the lightest neutrino mass (in
normal ordering), and the sum of neutrino masses. The predicted values
fall within reach of current and near-future measurements, making the
framework directly testable in 0νββ searches.
