Grand Unified Theory with a Stable Proton

TL;DR

This paper presents a minimal non-supersymmetric SU(5) grand unified theory that avoids proton decay, achieves gauge coupling unification, and predicts new particles at the TeV scale accessible at the LHC.

Contribution

It introduces a novel construction of a GUT with no proton decay by separating quark and lepton multiplets, enabling a viable and testable model.

Findings

Proton decay is suppressed in the proposed GUT model.

Gauge coupling unification is successfully achieved.

Some new particles are predicted at the TeV scale, accessible at the LHC.

Abstract

We demonstrate that a phenomenologically viable four-dimensional grand unified theory with no proton decay can be constructed. This is done in the framework of the minimal non-supersymmetric SU(5) GUT by introducing new representations and separating the physical quark and lepton fields into different multiplets. In such a theory all beyond Standard Model particles are naturally heavy, but one can tune the parameters of the model such that gauge coupling unification is achieved and some of the new particles are at the TeV scale and accessible at the LHC.