Speaker
Diego Restrepo
(Universidad de Antioquia)
Description
We perform a systematic analysis of Standard Model extensions with an additional anomaly-free gauge $U(1)$ symmetry, to generate tree-level Dirac neutrino masses. An anomaly-free symmetry demands nontrivial conditions to the charges of the unavoidable new states. An intensive scan was performed, looking for solutions generating neutrino masses by the type-I and type-II tree-level Dirac seesaw mechanism, via operators with dimension 5 and 6, that correspond to active or dark symmetries. Special attention was paid to the case featuring no extra massless chiral fermions.
Authors
Diego Restrepo
(Universidad de Antioquia)
Nicolás Bernal
(Universidad Antonio Nariño)
