Regular Article - Theoretical Physics
Anomaly-free Abelian gauge symmetries with Dirac seesaws
Centro de Investigaciones, Universidad Antonio Nariño, Carrera 3 Este #, 47A-15, Bogotá, Colombia
2 Instituto de Física, Universidad de Antioquia, Calle 70 # 52-21, Apartado Aéreo, 1226, Medellín, Colombia
Accepted: 6 December 2021
Published online: 15 December 2021
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 on 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 cases featuring no extra massless chiral fermions or multicomponent dark matter with unconditional stability.
© The Author(s) 2021
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