Lepton Number Violation in Low Scale Seesaw Mechanism and its Collider Complementarity

TL;DR

This paper explores TeV scale left-right symmetric models with low scale seesaw mechanisms, analyzing their implications for neutrinoless double beta decay and collider phenomenology, highlighting the potential for observable signals at the LHC.

Contribution

It introduces a model with natural type-II seesaw dominance at TeV scale, linking neutrino mass, neutrinoless double beta decay, and collider signals, with numerical analysis supporting normal hierarchy.

Findings

Lower limit on lightest neutrino mass derived

Normal hierarchy favored by data

Potential collider signatures at LHC

Abstract

We consider the TeV scale left-right symmetric theory which can accommodate low scale seesaw mechanisms consistent with neutrino oscillation data and find new physics contributions to neutrinoless double beta decay. The model facilitates natural type-II seesaw dominance and the presence of extra particles make the Dirac neutrino mass matrix $M_D$ large that leads to large light heavy neutrino mixing. The spontaneous symmetry breaking through doublets, triplets and bidoublet scalars at TeV scale offers rich phenomenology accessible to LHC. From the numerical studies of the new physics contributions to neutrinoless double beta decay we derive a lower limit on absolute scale of lightest neutrino mass and find that normal hierarchy (NH) pattern is favorable taking into account the cosmology and oscillation data.