Lepton Number Violation within the Conformal Inverse Seesaw

TL;DR

This paper introduces a conformal inverse seesaw model that allows significant lepton number violation at low scales, predicts observable rare decay processes, and offers testable collider signatures involving new particles.

Contribution

It proposes a novel conformal inverse seesaw framework enabling large lepton number violation with low-scale neutrino mass generation, including new collider and decay signatures.

Findings

Heavy sterile neutrinos can saturate neutrinoless double beta decay limits.

Distinct collider signatures include same-sign dileptons with jets.

Model predicts new scalars, fermions, and gauge bosons at accessible energies.

Abstract

We present a novel framework within the conformal inverse seesaw scheme allowing large lepton number violation while the neutrino mass formula is still governed by the low-scale inverse seesaw mechanism. This model includes new contributions to rare low-energy lepton number violating processes like neutrinoless double beta decay. We find that the lifetime for this rare process due to heavy sterile neutrinos can saturate current experimental limits. The characteristic collider signature of the present conformal inverse seesaw scheme includes, same-sign dilepton plus two jets and same-sign dilepton plus four jets. Finally, we comment on the testability of the model at the Large Hadron Collider since there are new scalars, new fermions and an extra neutral gauge boson with masses around few 100 GeV to few TeV.