Clockwork seesaw mechanisms

TL;DR

This paper introduces novel clockwork-based mechanisms for generating small neutrino masses, leveraging exponential suppression through zero modes, with various model types exhibiting unique phenomenological signatures involving heavy neutrinos.

Contribution

It presents new clockwork mechanisms for neutrino mass generation, exploring different model realizations based on zero mode profiles and chiralities.

Findings

Different clockwork neutrino models are realized.

Distinct phenomenological features with heavy neutrinos are identified.

Exponential suppression of couplings is achieved through clockwork zero modes.

Abstract

We propose new mechanisms for small neutrino masses based on clockwork mechanism. The Standard Model neutrinos and lepton number violating operators communicate through the zero mode of clockwork gears, one of the two couplings of the zero mode is exponentially suppressed by clockwork mechanism. Including all known examples for the clockwork realization of the neutrino masses, different types of models are realized depending on the profile and chirality of the zero mode fermion. Each type of realization would have phenomenologically distinctive features with the accompanying heavy neutrinos.