Quark lepton unification in higher dimensions

TL;DR

This paper proposes a higher-dimensional model that unifies quarks and leptons at the TeV scale, predicting new particles detectable at the LHC and offering a dark matter candidate.

Contribution

It introduces a novel extra-dimensional framework that breaks quark-lepton unification at TeV scale, enabling testable collider signatures and dark matter candidate.

Findings

Predicts leptoquark gauge bosons accessible at LHC

Identifies distinctive collider signatures like multi-jets and leptons

Proposes a stable neutral lepton as dark matter candidate

Abstract

The idea of unifying quarks and leptons in a gauge symmetry is very appealing. However, such an unification gives rise to leptoquark type gauge bosons for which current collider limits push their masses well beyond the TeV scale. We present a model in the framework of extra dimensions which breaks such quark-lepton unification symmetry via compactification at the TeV scale. These color triplet leptoquark gauge bosons, as well as the new quarks present in the model, can be produced at the LHC with distinctive final state signatures. These final state signals include high p_T multi-jets and multi-leptons with missing energy, monojets with missing energy, as well as the heavy charged particles passing through the detectors, which we also discuss briefly. The model also has a neutral Standard Model singlet heavy lepton which is stable, and can be a possible candidate for the dark matter.