New Mechanism for Neutrino Mass Generation and Triply Charged Higgs Boson at the LHC

TL;DR

This paper introduces a novel neutrino mass generation mechanism via dimension 7 operators involving an isospin 3/2 Higgs multiplet, predicting a triply charged Higgs boson at TeV scale detectable at colliders.

Contribution

It proposes a new dimension 7 operator-based neutrino mass model with a distinctive Higgs multiplet, differing from traditional see-saw models, and explores collider signatures of triply charged Higgs bosons.

Findings

Neutrino masses can be generated at TeV scale via dimension 7 operators.

Triply charged Higgs bosons can be produced at the LHC with multi-W and multi-lepton signatures.

Potential for long-lived particles with displaced vertices or detector escape.

Abstract

In this talk, I present a new mechanism for the generation of neutrino masses via dimension 7 operators: llHH(H*H)/M^3. This leads to new formula for the light neutrino masses, m_\nu~v^4/M^3. This is distinct from the usual see-saw formulae: m_\nu~v^2/M. The scale of new physics can naturally be at the TeV scale. Microscopic theory that generated d=7 operator has an isospin 3/2 Higgs multiplet \Phi, which contains a triply charged Higgs boson with mass around ~TeV or less. These particles can be produced at the LHC (and possibly at the Tevatron) with distinctive multi-W and multi-lepton final states. For some choice of the parameter space, these particles can also be long-lived with the possibility of displaced vertices, or even escaping the detector. Their leptonic decay modes carry information about the nature of the neutrino mass hierarchy.