Abstract

We propose an inverse seesaw model based on hidden global symmetry $U(1)_H$ in which we realize tiny neutrino masses with rather natural manner taking into account relevant experimental bounds. The small Majorana mass for inverse seesaw mechanism is induced via small vacuum expectation value of a triplet scalar field whose Yukawa interactions with standard model fermions are controlled by $U(1)_H$. We discuss the phenomenology of the exotic particles present in the model including the Goldstone boson coming from breaking of the global symmetry, and explore testability at the Large Hadron Collider experiments.

Highlights

  • Inverse seesaw mechanism [1,2] is one of the promising candidates to induce neutrino masses and their mixing, which are typically understood by an additional symmetry beyond the standard model (SM)

  • We have constructed an inverse seesaw model based on Uð1ÞH global symmetry in which we have introduced exotic lepton doublets L0 and new scalar fields including scalar triplet with Uð1ÞH charge

  • The exotic lepton doublets are vectorlike under gauge symmetry but chiral under Uð1ÞH and Majorana mass of neutral components are zero before Uð1ÞH symmetry breaking

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Summary

INTRODUCTION

Inverse seesaw mechanism [1,2] is one of the promising candidates to induce neutrino masses and their mixing, which are typically understood by an additional symmetry beyond the standard model (SM). We propose an inverse seesaw model under a hidden global Uð1ÞH symmetry [7]1 in which we try to realize natural hierarchies in a neutral fermion mass matrix, taking advantage of experimental constraints of electroweak precision to test our model. We show that their mass hierarchies could be naturally realized while maintaining the experimental bound on the new, heavier leptons Note that these hierarchies are related to our neutral fermion mass matrix. Onpe ffiffifinds that the charged-lepton mass matrix ml 1⁄4 ylv= 2

Scalar potential and VEVs
Charged-lepton sector
Ra cos θRa sin θRa θRa cos θRa ð10Þ tan 2θLa
Neutrino sector
PHENOMENOLOGY
Decay of exotic particles
Collider physics
14 TeV 300 fb 1
SUMMARY AND CONCLUSIONS

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