Clockwork for Neutrino Masses and Lepton Flavor Violation

Understand

We investigate the generation of small neutrino masses in a clockwork framework which includes Dirac mass terms as well as Majorana mass terms for the new fermions.

• We derive analytic formulas for the masses of the new particles and for their Yukawa couplings to the lepton doublets, in the scenario where the clockwork parameters are universal.
• When the Majorana masses all vanish, the zero mode of the clockwork sector forms a Dirac pair with the active neutrino, with a mass which is in agreement with oscillations experiments for a sufficiently large number of clockwork gears.
• On the other hand, when the Majorana masses do not vanish, neutrino masses are generated via the seesaw mechanism.